Neave and Warren went to buy computers at a sale. The usual price of 1 computer was $1300 each.

SALE
Buy 1 computer at 15% discount
Buy 2 or more computers at 20% discount each

1. Neave bought 1 computer. How much did he pay?
2. What is the maximum number of computers Warren can buy if he has $6000?

(a)
Discounted price of 1 computer in percent if only 1 was bought
= 100% - 15%
= 85%

100% of 1 computer = 1300
1% of 1 computer = 1300 ÷ 100 = 13
85% of 1 computer = 85 x 13 = 1105 

Amount that Neave paid for 1 computer = $1105

(b)
Discounted price of 1 computer in percent if more than 1 was bought
= 100% - 20%
= 80%

80% of 1 computer = 80 x 13 = 1040

Amount that Warren paid for 1 computer = $1040

Maximum number of computers that Warren can buy if he has $6000
= 6000 ÷ 1040
= 5 r 800

Answer(s): (a) $1105; (b) 5