Question

The price of an oven was increased by 20% to £156.
What was the price before the increase?

Answer 1

Before the increase it was 100%
So 20+100=120
156/120*100=130$

Don’t do it like 20/100 *156 and then minus it from 156 because you will get a wrong answer

Answer 2

Explanation:

Let the price before the increase = £ x

(100+20)% of x = £156

120% of x = 156

`(120)/(100)*x=156\\\\x=156*(100)/(120)\\`

x = £ 130