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
There are two sets of numbers. The second is the result of the
first after an increase by a constant percentage. How can you find
that percentage if one set of numbers is in code?
If a sum invested gains 10% each year how long before it has
doubled its value?
If the base of a rectangle is increased by 10% and the area is
unchanged, by what percentage (exactly) is the width decreased by