Question

a person purchased two washing machines at 9000 and soldone is at 10% loss and second one is at 10% gain

Answer 1

a person purchased 2 washing mashing at 9000
sold 1 washing machine at 10  % loss
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9000*10/100
900 rs he have loss
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so
9000-900
8100 he sale one washing machine of =8100
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on second he hve profit of 10%
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so 
9000*10/100
900 
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so 
9900 he have profit on 2 washing mashing 
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i hope this will help u
by DEVANSH