# 2 Answers

16 is to 20 as x is to 100.

16/20 = x/100

If each book cost $5 to buy, 20 books would cost $100. If you sold 16 books for the cost of 20, you would sell 16 books for $100. 16 books would have cost YOU $80 (16 x 5). That gives you a profit of $20.

20/100 = .20 = 20%

If each book cost $4 to buy, 20 books would cost you $80. You would sell 16 for $80 (which would have cost you $64 (16 x 4). Your profit would be 80 - 64 = $16. 16/80 = .20 = 20%

Your profit is 20 %

Play with it like that... You'll always come up with 20% profit.

5 years ago. Rating: 1 | |

Surely the point is that we are buying 20 books for the same price we are selling 16 of that at.

If you buy the books at £1.00 each = £20, and If we sell 16 of the books to achieve an income of £20 them we sell them at £1.25. The answer is nil. The questioner does not ask about any potential profit from the 4 unsold books which would give him a profit of 25% if he sold them.

5 years ago. Rating: 0 | |