Percentages and Profit

[mgodwin16]

From Barrons:
A grocer buys apples for 63 cents per pound. If 10% of the apples go bad and he still wants to make a 20% profit over his purchase price, what should be the sales price?


I used numbers. I said that he bought 10 lbs for a total of $6.30. if 1lb goes bad, he has 9lbs to make $7.56 (6.30*120%). So 7.56/9 = .84

However, this is incorrect and I'd like to know why my logic is wrong. Thanks

[RonPurewal]

From Barrons:
A grocer buys apples for 63 cents per pound. If 10% of the apples go bad and he still wants to make a 20% profit over his purchase price, what should be the sales price?


I used numbers. I said that he bought 10 lbs for a total of $6.30. if 1lb goes bad, he has 9lbs to make $7.56 (6.30*120%). So 7.56/9 = .84

However, this is incorrect and I'd like to know why my logic is wrong. Thanks

your logic looks fine to me.
according to the source, what's supposed to be the answer?