Question 826170
He bought some B liters of milk at 60 P money units, and added {{{1/3)B}}} liters of water.  The mixture is {{{B+(1/3)B}}} liters containing the B liters of milk.


His revenue upon selling all of his mixture is {{{B(1+1/3)*72}}} P money units.


Summarize:
Cost = {{{B*60}}} P units
Revenue = {{{B(1+1/3)*72}}} P units
Profit = {{{Revenue - Cost = B(4/3)*72-B*60 = B((4/3)72-60)}}} of P money units


Profit percentage based on revenue woould be {{{100*(B((4/3)72-60))/(B(1+1/3)*72)}}}, if that was what you meant; which you can simplify and compute.


If you meant, based on cost, then divide profit by cost, and then multiply by 100.