A dishonest milkman buys milk at Rs 30 per litre and adds 1/5 of water to it and sells the mixture at Rs 32 per litre. What will be his gain?
The milkman adds $$(\frac{1}{5})^{th}$$ of water, thus total mixture = $$1+\frac{1}{5} = \frac{6}{5}$$
Cost price per litre of the mixture = $$\frac{30}{\frac{6}{5}} = 30 \times \frac{5}{6} = Rs$$ $$25$$
Selling price per litre = Rs. 32
$$\therefore$$ Profit % = $$\frac{32-25}{25} \times 100$$
= $$7 \times 4 = 28\%$$
=> Ans - (C)
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