Pierre and Mark went to buy television sets at a sale. The usual price of 1 television set was $700 each.

SALE
Buy 1 television set at 10% discount
Buy 2 or more television sets at 20% discount each

1. Pierre bought 1 television set. How much did he pay?
2. What is the maximum number of television sets Mark can buy if he has $5000?

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

100% of 1 television set = 700
1% of 1 television set = 700 ÷ 100 = 7
90% of 1 television set = 90 x 7 = 630 

Amount that Pierre paid for 1 television set = $630

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

80% of 1 television set = 80 x 7 = 560

Amount that Mark paid for 1 television set = $560

Maximum number of television sets that Mark can buy if he has $5000
= 5000 ÷ 560
= 8 r 520

Answer(s): (a) $630; (b) 8