One merchant correctly calculates his profit percentage on the cost price; another wrongly calculates it on the selling price. Find the difference in the actual profits if both claims to make 30% profit, and their revenue is 3900.

Correct profit percentage is $P/C.P*100=30$

Wrongly calculated profit $P/S.P*100=30$ $P/3900*100=30$ which gave me $1170$

How to calculate profit from correct profit percentage? Also, let me know if I am doing it right


1 Answer 1



The profit in the first case is $P_1=\frac{3900-C_1}{C_1}=0.3$

And the profit in the second case $P_2=\frac{3900-C_2}{3900}=0.3$

  • $\begingroup$ Thanks @callculus $\endgroup$
    – onlymaths
    Jun 18, 2017 at 18:26
  • $\begingroup$ You´re welcome. $\endgroup$ Jun 18, 2017 at 18:27
  • $\begingroup$ You can accept the answer if you want. $\endgroup$ Jun 18, 2017 at 18:32
  • $\begingroup$ Didn't get what you saying?@callculus $\endgroup$
    – onlymaths
    Jun 18, 2017 at 18:35

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