1. An item of furniture is advertised at either $5 000.00 cash or deposit of $500.00 and twelve monthly payments of $400.00.
(a) Calculate the extra sum paid by HP
(b) Express this extra sum as a percentage of the cash price less the deposit

2. A survey of used car salesmen revealed the following information:
24 wear white patent-leather shoes
28 wear plaid trousers
20 wear both of these things
2 wear neither of these things
(a) How many were surveyed?
(b) How many wear plaid trousers but don't wear white patent-leather shoes?

3. Given the points A(4, 3) and B (-2, -1), calculate:
(a) The gradient of the line AB
(b) The equation of the line AB