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Wiskunde

Persentasies

Opvoeders afdeling

Memorandum

17.4

a) R179,97

b) R254,58 (afgerond)

c) R10 665

d) R16 794,75

17.5.2

a) 10,7%

b) 10%

Leerders afdeling

Inhoud

Aktiwiteit: persentasie – afslag en verhoging [lu 1.7, lu 2.7.1]

17. PERSENTASIE – AFSLAG EN VERHOGING

17.1 Kyk na die volgende advertensies:

17.2 Het jy geweet?

KOSPRYS : die bedrag wat die handelaar vir ’n artikel betaal

MERKPRYS : dis die bedrag op die artikel

VERKOOPPRYS : dit is die prys na afslag

WINS : verkoopprys – kosprys

17.3 Werk saam met ’n maat deur die volgende probleem en oplossings:

(i) Die prys van ’n bakkie margarien is R6,99. As die prys met 10% gaan styg, hoeveel sal jy voortaan vir die margarien moet betaal??

a) Nuwe prys is R6,99 + 10% van R6,99

= R6,99 + 70 c (afgerond)

= R7,69

b) Nuwe prys is (100 + 10)% van R6,99

= 110% van R6,99

= R7,69 (afgerond)

Wie se metode verkies jy? ..................................................

Hoekom? ………………………………………………………………………………

………………………………………………………………………………………….

………………………………………………………………………………………….

(ii) Top Tiener Tooisels het ’n 20% afslag op alle T-hemde. As die hemp oorspronklik R189,90 gekos het, wat sal jy nou daarvoor betaal?

a)

Ek betaal nou net 80% (100% - 20% afslag)

Dus: 80 100 × 189 , 90 1 size 12{ { { size 8{"80"} } over { size 8{"100"} } } times { { size 8{"189","90"} } over { size 8{1} } } } {}

= R 151, 92

b)

20% van R189,90 = 20 100 × 189 , 90 1 size 12{ { { size 8{"20"} } over { size 8{"100"} } } times { { size 8{"189","90"} } over { size 8{1} } } } {}

Die afslag is dus R37,98

Ek betaal R189,90 – R37,98 = R151,92

Watter metode verkies jy? ..................................................

Hoekom? ………………………………………………………………………………

………………………………………………………………………………………….

………………………………………………………………………………………….

17.4 Wat sal jy vir die volgende items betaal?

17.5.1 Belangrik om te onthou

17.5.2 Deel in groepe van drie. Kan julle bereken hoeveel % afslag op die volgende items gegee is?

17.5.3 Verduidelik jul metodes(s) aan die res van die klas.

Assessering

Leeruitkomste 1: Die leerder is in staat om getalle en die verwantskappe daarvan te herken, te beskryf en voor te stel, en om tydens probleemoplossing bevoeg en met selfvertroue te tel, te skat, te bereken en te kontroleer.

Assesseringstandaard 1.7: Dit is duidelik wanneer die leerder skat en bereken deur geskikte bewerkings vir probleme wat die volgende behels, te kies en te gebruik:

Leeruitkomste 2: Die leerder is in staat om patrone en verwantskappe te herken, te beskryf en voor te stel en probleme op te los deur algebraïese taal en vaardighede te gebruik.

Assesseringstandaard 2.7: Dit is duidelik wanneer die leerder die ekwivalensie van verskillende beskrywings van dieselfde verhouding of reël, bepaal, ontleed en interpreteer, wat soos volg voorgestel word:

2.7.1 woordeliks.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Wiskunde graad 7. OpenStax CNX. Oct 21, 2009 Download for free at http://cnx.org/content/col11076/1.2
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