The correct option is B 1 : 8
Let, CP = Rs. 100, then SP = Rs. 112.5
Hence, CP : SP = 100 : 112.5
∴ Proportion of amount of solution in both the cases = 100 : 112.5 = 8 : 9
∴ Proportion of water need to be mixed to spirit = (9−8)8=18
Alternative Approach:
Profit =12.5%=18
Hence the ratio of water to spirit is 1 : 8
Since profit %=profitcost×100