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7.Profit and Loss
medium
A dairyman pays $Rs.\, 6.40$ per litre of milk. He adds water and sells the mixture at $Rs.\, 8$ per litre, thereby making $37.5\%$ profit. The proportion of water to milk received by the customers is
A
$1: 10$
B
$1: 12$
C
$1:15$
D
$1:20$
Solution
Profit $=37.5 \%$
$C.P.$ $=6.4 ; \quad$ $S.P.$ $=8$
$\therefore$ Mean cost price $=\frac{100}{137.5} \times 8=Rs. \frac{64}{11}$
$\therefore \quad$ Required ratio $=\frac{64}{110}: \frac{64}{11}=1: 10$
Standard 13
Quantitative Aptitude
