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The cost price of 10 pens is the same as the selli price of a pens. If there is a loss of 40% approximately what is the value of n?
Let, the cost price of each pen is 1 tk. ∴The cost price of n pen is = n tk. Given, selling price of 10 pens = 10 tk. ∴ loss= (n-10) tk. ∴(n-10n×100)%=40% [As, loss%=CP-SPCP×100] =n-10n×100=40 =100n-1000=40n =60n=-1000 ∴n=100060=16.667% ∴n=17%(Approximately) ans.
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