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July 30th, 2019, 07:31 AM   #1
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How profit% equation obtained?

Even after reducing the marked price of a transistor by Rs 32, a shopkeeper makes a profit of 15%. If the C.P be Rs 320., what % of profit would he have made if he had sold the transistor at M.P?

Solution:
profit% = 32/320*100 = 10%

total profit = 15+10 = 25.

How profit% equation obtained?

Last edited by skipjack; July 30th, 2019 at 09:39 AM.
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July 30th, 2019, 09:51 AM   #2
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The profit, as a percentage of the C.P., is (S.P. - C.P.)/C.P.×100%, so if the S.P. changes by an amount r, that percentage changes by (S.P.+ r - C.P.)/C.P.×100% - (S.P. - C.P.)/C.P.×100% = r/C.P.×100%, which is 32/320×100% for the change described.
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July 30th, 2019, 11:14 PM   #3
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How can you tell given question contains S.P. changes by an amount r?

In the question, nowhere mentioned about S.P.

There are two sentences in the question, how can you tell CP is 320 in both sentences?

Last edited by Ganesh Ujwal; July 30th, 2019 at 11:25 PM.
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