self Maths Puzzle

A man buys milk at 10 rupee/liter adds 1/3 of water to it and sells the mixture at 12 rupee/liter his gain in percentage

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self Other Question

A no is increases by 10% and after it decreases by 10%. What will be the % change in no either increase or decrease. 2,8,16,128,2048,?
find the missing value