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Standard VII
Mathematics
Understanding Cost per Unit in Every Day Life Situation
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Question
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A man buys a book for Rs 80 and sells it for Rs 100. His gain % is
(a) 20%
(b) 25%
(c) 120%
(d) 125%
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Solution
(b) 25%
CP of the book = Rs. 80
SP of the book = Rs. 100
Gain = SP - CP = Rs. (100 - 80) = Rs. 20
Gain
%
=
Gain
CP
×
100
%
=
20
80
×
100
%
=
25
%
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