A man buys milk at 60 P per litre, adds one-third of water to it and sells the mixture at 72 P per litre. The profit per cent is_____.
Original volume =1L
New volume =1+12=43L
Cp=60P/L
Sp=72P/L
43L→60
1L→60×34=45Rs. (New CP)
Profit %=sp−cpcp×100
=72−4545×100
=60%.