# Module 2 - Unit 1: Percentages

## Self-Audit

For the multiple choice questions below, choose one answer, (a), (b), (c) or (d), that is CORRECT by clicking the appropriate box.
Calculators are NOT allowed unless it is indicated in the question.

## Section 1.1 - Introduction to Percentages

Question 1
What percentage of the shape below is shaded? (A)
 3 10   (B)
 3 8
(C)
 1 3
(D)
 5 8
Question 2
What percentage of the shape below is NOT shaded? (A)
 1 4   (B)
 1 2
(C)
 3 4
(D)
 None of these Question 3
 What is 10% of 500 kg? (A) 5 kg   (B) 50 kg (C) 100 kg (D) 500 kg
Question 4
 What is 15% of 40 m? (A) 3 m   (B) 4 m (C) 6 m (D) 15 m

## Section 1.2 - Decimals, Fractions and Percentages

Question 5
 What is 35% as a decimal? (A) 0.35   (B) 0.70 (C) 3.5 (D) None of these
Question 6
 What is 0.8 as a percentage? (A) 0.8%   (B) 8% (C) 80% (D) None of these
Question 7
What is 8% as a fraction in its simplest form?
(A)
 8 100   (B)
 4 50
(C)
 8 10
(D)
 2 25
Question 8
 What is 7 as a percentage? 10
(A)0.7%   (B)7%
(C)70%
(D)700%

## Section 1.3 - Finding Percentages

Question 9
 Calculate 20% of 60 kg. (A) 6 kg   (B) 12 kg (C) 20 kg (D) 24 kg
Question 10
 Calculate 75% of 84 m. (A) 21 m   (B) 42 m (C) 62 m (D) None of these
Question 11
A bike costs \$120 before GCT is added.
How much is the GCT on this amount if it is
 charged at 17 1 %? 2
(A)\$12   (B)\$18
(C)\$21
(D)\$24
Question 12
 How much more is the GCT on the bike in Question 11 if it is charged at 20%? (A) \$3   (B) \$6 (C) \$12 (D) \$24

## Section 1.4 - Increasing and Decreasing Quantities by a Percentage

Question 13
 The price of a portion of jerk chicken and fries is \$3. What would be the price after an increase of 20%? (A) \$3.30   (B) \$3.60 (C) \$4.00 (D) None of these
Question 14
 What would be the price of the portion of jerk chicken and fries in Question 13 if, after the inital 20% increase, there was a decrease of 10%? (A) \$3.30   (B) \$3.27 (C) \$3.24 (D) \$2.70
Question 15
 The price of a laptop computer is \$500. In a sale, it is reduced by 15%. What is the sale price? (A) \$400   (B) \$425 (C) \$450 (D) \$485
Question 16
 A scientific calculator costs \$10. A teacher orders 40 of these for her class and is given a 10% discount. How much does the school pay in total? (A) \$340   (B) \$360 (C) \$390 (D) \$400

## Section 1.5 - Finding the Percentage Increase and Decrease

Question 17
 The price of a chocolate bar is increased from 50 cents to 55 cents. What is the percentage increase? (A) 5%   (B) 10% (C) 15% (D) 20%
Question 18
 The price of a drink is reduced from \$2 to \$1.60. What is the percentage decrease? (A) 10%   (B) 20% (C) 25% (D) 40%
Question 19
 The price of butter, per kg, is increased from \$2.24 to \$2.48. What is the percentage increase to the nearest one decimal place? (A) 21.4%   (B) 21.43% (C) 21.5% (D) None of these
Question 20
 In a sale, the price of a bike is reduced from \$120 to \$95. What is the percentage reduction in price, to the nearest one decimal place? (A) 20.0%   (B) 25.0% (C) 20.8% (D) 20.9%

## Section 1.6 - Reverse Percentage Calculations

Question 21
 Tom's salary was increased by 5% to \$8610. What was his original salary? (A) \$8000   (B) \$8179.50 (C) \$8200 (D) \$8250
Question 22
 In a sale, the price of a microwave oven was reduced by 11% to \$356. What was the total amount of discount? (A) \$39   (B) \$44 (C) \$45 (D) None of these
Question 23
The cost of tickets to a concert, including GCT
 at 17 1 % is \$282. 2
What would be the cost without GCT?
(A)\$220   (B)\$240
(C)\$250
(D)\$260
Question 24
 How much extra would you have to pay for the concert ticket in Question 23 if the GCT was 20% (A) \$3   (B) \$6 (C) \$12 (D) \$18 Mark your answers.