Dylan and Vincent went to buy massage chairs at a sale. The usual price of 1 massage chair was $300 each.

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

1. Dylan bought 1 massage chair. How much did he pay?
2. What is the maximum number of massage chairs Vincent can buy if he has $4000?

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

100% of 1 massage chair = 300
1% of 1 massage chair = 300 ÷ 100 = 3
85% of 1 massage chair = 85 x 3 = 255 

Amount that Dylan paid for 1 massage chair = $255

(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 3 = 240

Amount that Vincent paid for 1 massage chair = $240

Maximum number of massage chairs that Vincent can buy if he has $4000
= 4000 ÷ 240
= 16 r 160

Answer(s): (a) $255; (b) 16