Percentage

Question 0

Method 2:

Find 30% of £170

Answer 0

30/100 * 170/1 = 30 * 170/100
= 5100/100
= £51

Question 1

Method 1:

Find 20% of 84kg

Answer 1

10% = 8.4
20% = 8.4 * 2
20% = 16.8kg

Question 2

Percentage increase:

What multiplying factor would increase a value by 23%?

Answer 2

100% + 23% = 123%
= 123/100
= 1.23

Question 3

Percentage decrease:

What multiplying factor would decrease a value by 13%?

Answer 3

100% - 13% = 87%
= 87/100
= 0.87

Question 4

Reverse Percentages:

All prices reduced by 20%, if item costs £8.60, what was original price?

Answer 4

x = original price
(100% - 20%) = 0.8
x * 0.8 = 8.6
x = 8.6/0.8
x = £10.57