In what proportion water must be added to spirit to gain 20% by selling it at the cost price ?	Choose the correct choice from the following
A) 1 : 9 B) 1 : 1 C) 1 : 5 D) 1 : 3 E) 1 : 4
Let the C.P of spirit be = Rs.10 per litre   S.P of the mixture = Rs. 10 per litre   Profit = 20   C.P of the mixture = Rs. = Rs. per litre   Ratio of water and spirit = 1 : 5   Answer:1 : 5
<result>C</result>
In what proportion water must be added to spirit to gain 20% by selling it at the cost price ?