Question

a man sold two washing machines for rs9900 each. he sold one at a gainof 10% and the other at a loss of 10% find his gain or loss%in the whole transaction.

Answer 1

For 1st washing machine :

Cp = 9900

Profit %= 10%

Sp = 9900 + 9900 /100 * 10 ( taking out the percentage)
     = Rs 10,980
 
Profit = Rs 990

For 2nd washing machine:

Cp = 9900

Loss % = 10 %

Sp = 9900 - 9900/100*10
     = Rs 8910

loss = Rs 990

Balance on whole transaction = 10980 - 8910
                                                = 1980

Therefore his profit is = 1980
And profit % =  1980 / 19800 (9900 * 2)  * 100
                    = 10 %

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