A shopkeeper 7

A shopkeeper bought 80 cricket bats for 2.55 euros each. He sells 20 of them at a 5% gain. What must be the gain percentage of the remaining bats to get a 10% gain overall?

Correct answer:

g2 =  11.6667 %

Step-by-step explanation:

n=80  r1​=100%+5%=1+1005​=1.05  n1​=20 n2​=n−n1​=80−20=60  r=100%+10%=1+10010​=1.1  r⋅ n=n1​⋅ r1​+n2​⋅ r2​ 1.1⋅ 80=20⋅ 1.05+60⋅ r2​  60r2​=67  r2​=6067​=1.11666667  r2​=6067​≐1.116667  g2​=100⋅ (r2​−1)=100⋅ (1.1167−1)=11.6667%

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