## How to solve similar problems in a few seconds, Profit and loss problem 2, Domain modeling

Submitted by Atanu Chaudhuri on Mon, 29/02/2016 - 11:32

A man sells two wrist watches one at a profit of 50% and another at a loss of 50%, but each at a same selling price of Rs.300. The net profit or loss is...This type of problem can be solved in a few seconds if you can form its Domain model by Abstraction and Repeated solving of similar problems with controlled variation...