18 Sales!
To sell its stock of exercise books, a publishing house
decides to batch them.
_v) Initially, each exercise book costs £ 3.10. But, when sold
in batch of 5, the publisher sells it at a reduced price.
1. By noting r the reduction, express with two different
calculations the price P of the batch of 5 exercise
books.
2. Calculate P for a reduction of 35 pence.