To gain 10% on selling sample of milk at the cost price of pure milk, the quantity of water to be mixed with 50 kg. of pure milk is:

To gain 10% on selling sample of milk at the cost price of pure milk,

1.	To gain 10% on selling sample of milk at the cost price of pure milk, the quantity of water to be mixed with 50 kg. of pure milk is:
A.	2.5 kg
B.	5 kg
C.	7.5 kg
D.	10 kg
Answer» C. 7.5 kg