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If the base of a rectangle is increased by 10% and the area is unchanged, by what percentage (exactly) is the width decreased by ?

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CD Heaven

All CD Heaven stores were given the same number of a popular CD to sell for £24. In their two week sale each store reduces the price of the CD by 25% ... How many CDs did the store sell at each price?

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Dating Made Easier

If a sum invested gains 10% each year how long before it has doubled its value?

A Change in Code

Stage: 4 Challenge Level: Challenge Level:1
Notice that whole numbers have stayed as whole numbers after the increase.

What could all the original numbers be divided by without producing a decimal anywhere in the results column?