SOLUTION: 1. If a man buys 1 lt of milk for Rs.12 and mixes it with 20% water and sells it for Rs.15, then what is the percentage of gain?

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Question 581145: 1. If a man buys 1 lt of milk for Rs.12 and mixes it with 20% water and sells it for Rs.15, then what is the percentage of gain?

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I don't think it matters how much water is added.
Even if he added 21% water, he still
has +15+-+12+=+3+, Rs.3 more than he
started with, and +%283%2F12%29%2A100+=+100%2F4+
+100%2F4+=+25+
He has 25% gain