The selling price of 10 books is equal
to the cost price of 11
books. What is the gain % ?
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let cp of 1 book be x
cp of 11 books = 11x = sp of 10 books
cp of 10 books = 10x
gain = sp - cp
= 11x - 10x
= x
gain%= gain/cp × 100
= x/10x × 100
= 1/10×100
= 10 %
gain % = 10%
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