# How to solve questions 10 ,11and 13

Please find below the solution to the asked query:

10.

Given : A shop owner bought a packet of 50 cookies for Rs 187.50 and is selling them at a 20% profit.

So,

Selling price of 50 cookies = 187.50 + 20% of 187.50 = 187.50 + $\frac{20\times 187.50}{100}=187.50+\frac{187.50}{5}=187.50+37.50=\mathbf{225}$

Then ,

Selling price of a cookie = $\frac{225}{50}$ = Rs . 4.5

Therefore,

Shabnam can buy total number of cookies if she has Rs 36 = $\frac{36}{4.5}$ =

**8 ( Ans )**

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