Jeremy and Tommy went to buy massage chairs at a sale. The usual price of 1 massage chair was $900 each.

SALE
Buy 1 massage chair at 15% discount
Buy 2 or more massage chairs at 20% discount each

1. Jeremy bought 1 massage chair. How much did he pay?
2. What is the maximum number of massage chairs Tommy can buy if he has $3000?

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

100% of 1 massage chair = 900
1% of 1 massage chair = 900 ÷ 100 = 9
85% of 1 massage chair = 85 x 9 = 765 

Amount that Jeremy paid for 1 massage chair = $765

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

80% of 1 massage chair = 80 x 9 = 720

Amount that Tommy paid for 1 massage chair = $720

Maximum number of massage chairs that Tommy can buy if he has $3000
= 3000 ÷ 720
= 4 r 120

Answer(s): (a) $765; (b) 4