Seth and John went to buy massage chairs at a sale. The usual price of 1 massage chair was $1500 each.

SALE
Buy 1 massage chair at 10% discount
Buy 2 or more massage chairs at 20% discount each

1. Seth bought 1 massage chair. How much did he pay?
2. What is the maximum number of massage chairs John can buy if he has $8000?

(a)
Discounted price of 1 massage chair in percent if only 1 was bought
= 100% - 10%
= 90%

100% of 1 massage chair = 1500
1% of 1 massage chair = 1500 ÷ 100 = 15
90% of 1 massage chair = 90 x 15 = 1350 

Amount that Seth paid for 1 massage chair = $1350

(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 15 = 1200

Amount that John paid for 1 massage chair = $1200

Maximum number of massage chairs that John can buy if he has $8000
= 8000 ÷ 1200
= 6 r 800

Answer(s): (a) $1350; (b) 6