1. a book costs £7.34 work out the cost of 25 books
2. 20 of the maths books have plastic covers. write 20 out of 25 as a percentage
3. simplify fully - 6n + 7n-8n, 4a x 5b
4. multiply out - 3(2x + 5)
5. Work out 60% of 5300kg
find the simple interest on £2500 for 2 years at 6% per year.
6. a shop sells different sound systems on credit. the weekly payment is w pounds. the total amount paid, c pounds, is given by the formula c = 10w + 35.
the total amount paid for a mini sound system is £260.
calculate the weekly payment for a mini sound system