A milk seller pays Rs. 500 per kilolitre for his milk. He adds water to it and sells the mixture at 56 P a litre,thereby making altogether `40%` profit. Find the proportion of water to milk which his customers receive ?

Options

A. 1 : 4
B. 2 : 3
C. 1 : 5
D. 4 : 1

Answer

To solve the problem, we will follow these steps:

### Step 1: Calculate the Cost Price of the Mixture
The milk seller pays Rs. 500 per kilolitre for milk. Since he sells the mixture at a profit of 40%, we first need to find the selling price of the mixture.

Let the cost price (CP) of 1 litre of milk be:
\[ CP = \frac{500 \text{ Rs}}{1000 \text{ litres}} = 0.5 \text{ Rs/litre} \]