Suppose there's a cloth shop nearby your house. You decided to buy cloth from it. There was a owner of the shop and only one worker. You are a good friend of the owner but he's not there in the shop. So you purchase 1m cloth from the worker for Rs.30. When the owner came back the worker told him all he had done then the owner gave the worker Rs.5 to return back to his friend as he took the cloth in an expensive price. So the worker gave his friend Rs.3 and took Rs.2 for himself......If we calculate the problem we get that the friend bought the cloth for Rs.30-3= 27 and the worker had Rs.2 so 27+2=29....But it was first bought at Rs.30..Where did Rs.1 gone.....Best of luck for solving friends........