Question

A shop advertises 10% off its prices in a sale.

A book is £6.30 in the sale
How much was it before the price reduction?​

Answer 1

£7

Explanation:

Since the sale is 10% the original price, every item is being sold for 90% of its original price. Now the problem is: £6.30 is 90% of what number?

Let x = original price before sale

6.30 = 0.9x

0.9x = 6.3

Divide both sides by 0.9

x = 6.3/0.9

x = 7

Answer: £7