Ahmad and Howard went to buy projectors at a sale. The usual price of 1 projector was $500 each.

SALE
Buy 1 projector at 15% discount
Buy 2 or more projectors at 25% discount each

1. Ahmad bought 1 projector. How much did he pay?
2. What is the maximum number of projectors Howard can buy if he has $8000?

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

100% of 1 projector = 500
1% of 1 projector = 500 ÷ 100 = 5
85% of 1 projector = 85 x 5 = 425 

Amount that Ahmad paid for 1 projector = $425

(b)
Discounted price of 1 projector in percent if more than 1 was bought
= 100% - 25%
= 75%

75% of 1 projector = 75 x 5 = 375

Amount that Howard paid for 1 projector = $375

Maximum number of projectors that Howard can buy if he has $8000
= 8000 ÷ 375
= 21 r 125

Answer(s): (a) $425; (b) 21