數學題about profit and loss per cent．．．

2007-03-15 4:14 am

A company purchased 50sets of software at $80 000. The first 40 sets were sold at $2000 each and the remaining 10 sets were sold at $900each.

(a)Find the profit per cent for the first 40 sets of software.(The answer is 25%)
(b)Find the loss cent for the last 10 sets of software.(The answer is 43.75%)
(c)Find the overall profit per cent or loss per cent.

I don't know how to do (c), please help me！

回答 (1)

阿力仔

2007-03-15 4:22 am

✔ 最佳答案

(a) Selling price for first 40 sets = $2000 x 40 = $80000
Cost price for first 40 sets = $80000 x 40/50 = $64000
Profit per cent = ($80000 - $64000)/$64000 * 100% = 25%

(b) Selling price for remaining 10 sets = $900 x 10 = $9000
Cost price for remaining 10 sets = $80000 x 10/50 = $16000
Loss per cent = ($16000 - $9000)/$16000 * 100% = 43.75%

(c) Selling price for all 50 sets = $80000 + $9000 = $89000
Cost price for all 50 sets = $80000
Overall profit per cent = ($89000 - $80000)/$80000 * 100% = 11.25% (profit)

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