Owen and Tom went to buy hard drives at a sale. The usual price of 1 hard drive was $1900 each.

SALE
Buy 1 hard drive at 15% discount
Buy 2 or more hard drives at 30% discount each

1. Owen bought 1 hard drive. How much did he pay?
2. What is the maximum number of hard drives Tom can buy if he has $7000?

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

100% of 1 hard drive = 1900
1% of 1 hard drive = 1900 ÷ 100 = 19
85% of 1 hard drive = 85 x 19 = 1615 

Amount that Owen paid for 1 hard drive = $1615

(b)
Discounted price of 1 hard drive in percent if more than 1 was bought
= 100% - 30%
= 70%

70% of 1 hard drive = 70 x 19 = 1330

Amount that Tom paid for 1 hard drive = $1330

Maximum number of hard drives that Tom can buy if he has $7000
= 7000 ÷ 1330
= 5 r 350

Answer(s): (a) $1615; (b) 5