by selling 200 books a man gains the selling price of 100 books find his gain percentage
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=if sp of 200 books is 200
:he gain sp of 100 books
...........
:100÷200×100
..........
:his gain is 50%
:he gain sp of 100 books
...........
:100÷200×100
..........
:his gain is 50%
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