# 3.9 Percentages – discount and increases

 Page 1 / 1

## Memorandum

17.4

a) R179,97

b) R254,58 (rounded off)

c) R10 665

d) R16 794,75

17.5.2

a) 10,7%

b) 10%

## Activity: percentages – discount and increases [lo 1.7, lo 2.7.1]

17. PERCENTAGES – DISCOUNT AND INCREASES

17.2 Did you know?

COST PRICE : The amount that the dealer / trader / merchant pays for an article

MARKED PRICE : This is the price of the article

SELLING PRICE : This is the price after discount

PROFIT : Sale price – cost price

17.3 Work together with a friend through the following problem and solutions:

(i) The price of a tub of margarine is R6,99. If the price is going to rise by 10 %, how much will you have to pay for the margarine in the future?

a) New price is R6,99 + 10% of R6,99= R6,99 + 70 c (rounded off)= R7,69

b) New price is (100 + 10)% of R6,99

= 110% of R6,99

$=\frac{\text{110}}{\text{100}}×\frac{\text{699}}{1}$

= R7,69 (rounded off)

Which method do you choose? ..................................................

Why? ……………………………………………………………………………

(ii) Top Teenage T-shirts have a 20 % discount on all T-shirts. If the T-shirt originally cost R189,90, what will you pay for it now?

a)

I only pay 80% (100% - 20% discount)

Thus: $\frac{\text{80}}{\text{100}}×\frac{\text{189},\text{90}}{1}$

= R 151, 92

b)

20% of R189,90 = $\frac{\text{20}}{\text{100}}×\frac{\text{189},\text{90}}{1}$

The discount is thus R37,98

I pay R189,90 – R37,98 = R151,92

Which method do you choose? ..................................................

Why?

17.4 What will you pay for the following items?

17.5.1 Important to remember!

17.5.2 Divide into groups of three. Can you calculate how much % discount was given on the following items?

17.5.3 Explain your method(s) to the rest of the class.

## Assessment

Learning Outcome 1: The learner will be able to recognise, describe and represent numbers and their relationships, and to count, estimate, calculate and check with competence and confidence in solving problems.

Assessment Standard 1.7: We know this when the learner estimates and calculates by selecting and using operations appropriate to solving problems;

Learning Outcome 2: The learner will be able to recognise, describe and represent patterns and relationships, as well as to solve problems using algebraic language and skills.

Assessment Standard 2.7: We know this when the learner determines, analyses and interprets the equivalence of different descriptions of the same relationship or rule presented:

2.7.1 verbally.

how can chip be made from sand
is this allso about nanoscale material
Almas
are nano particles real
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
no can't
Lohitha
where is the latest information on a no technology how can I find it
William
currently
William
where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Researchers demonstrated that the hippocampus functions in memory processing by creating lesions in the hippocampi of rats, which resulted in ________.
The formulation of new memories is sometimes called ________, and the process of bringing up old memories is called ________.
Got questions? Join the online conversation and get instant answers!