Reverse percentages

How do we calculate 70 increased by 30%?

How do we calculate 43 decreased by 26%?

A T-shirt has been reduced by 15% in the sale. It now costs £17, what was the original cost?

The amount of chocolates in a tub of celebrations has been increased by 25%. If there are 65 sweets in the tub now, how many were there originally?

How would you rate your understanding of reverse percentages?

(5 being the highest)

In one year the population of an island increased by 5% to 288960 people. Work out the population of the island before the increase.

A holiday is advertised at £760 after it is reduced by 20% in a sale. What was the original price before the sale?

A new car falls in value by 30% in a year. After a year it is worth £8400. Find the price of the car when it was new.

A radio sells for £63 after a 40% increase in the cost price. Find the cost price.

I have just paid £88 for my water bill. This is an increase of 10% from last year. How much did I pay last year?

I bought a top for £24. It was in the sale with 20% off. What was the original cost of the top?