Question

a shopkeeper buys 50 penccils for rupees 80 and sells them 40 pencil for 90 rupees . find the gain or loss
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Answer 1

Given total cost = 80 and no. of pencil is = 50.

the cost of 1 pencil is 80/50 = 8/5rs.

now for 40 pencil the cost would be 40*(8/5) = 64 rs

but he sold those at 80rs in total.

so gain % is (80-64)/64 = 16/64 = 25%

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