N2 Ratio and Proportion

Question 1

How would find a percentage increase of a number, e.g. 2% increase on £20?

Answer 1

Multiply number being increased by 1.02.

So £20 x 1.02 = £20.40.

Question 2

How would you find a percentage decrease of a number, e.g. 15% decrease on £50?

Answer 2

Subtract 15 from 100 = 85, so multiply the number by 0.85.

£50 x 0.85 = £42.50.

Question 3

How would you work out 72% of a number without a calculator?

Answer 3

Multiply it by 0.72.