10. The cost price of 8 books is equal to the selling price of 6 books. Find the gain percent
answer of 9.=100/3
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Assume the cost price of one book = C
Selling price of one book = S
According to the question
8 C = 6S
C= 3S/4
Gain % = (S-C)x100/C
= Sx100/4/(3S/4)
= 100/3
= 33.33 %
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