Ail is paid $1.25 for every tree he plants.He also receives a bonus of $5 for every 100 trees he plants.How many trees must Ail plant to earn $690?
Let's estimate how much approximately can be bought for $690. $690/ 1.25 = 552 trees. in 552 there are 5 hundreds. For each hundred you receive $5, hence 5*$5 = $25. Denote the number of trees as n. Thus $1.25 * n& - $25 =$690 n = (690 + 25)/1.25 = 572. In 572 there are still 5 hundreds, so the answer 572 is correct.
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