 Hello and welcome to the session. In this session we will discuss the following question and the question says, a man sells two watches at $38 each. On one he gains 20% and on other he loses 20%. What is his gain or loss percent on the real transaction? Let's start the solution now. We will first do an assumption that the first price of the first watch is equal to $100. Now it is given that on the first watch he gains 20%. So the profit on the first watch is equal to 20% of the cost price which is $100. This is equal to 20 upon 100 into $100. Zeros get cancelled and this is equal to $20. So the selling price of the first watch is equal to cost price which is $100 plus the profit which is $20 and this is equal to $120. So we have if selling price of first watch is $120 then cost price is equal to $100. Now we have given that the man sells both the watches at $38 each. So the selling price of first watch is $38. So therefore then selling price of first watch is $38 then cost price is equal to $100 upon $120 into $38. The Zeros get cancelled and $12 third times is $38. This is equal to $40. Now we will do an assumption for the second watch let cost price of second watch is equal to $100. We are given that on the second watch he loses 20%. So loss on the second watch is equal to 20% the cost price which is $100. This is equal to 20 upon 100 into $100. Zeros get cancelled and this is equal to $20. So the selling price of the second watch is equal to the cost price that is $100 minus the loss which is $20 and this is equal to $80. So we have if selling price of second watch is $80 then cost price is equal to $100. Now since we have given that he sells both the watches at $38 each. So the selling price of the second watch is also $38. So therefore when selling price of second watch is $48 then cost price is equal to $100 upon $80 into $38. Zeros gets cancelled and $8 sixth times is $48. This is equal to $60. Now we will calculate the total cost price of both the watches. So therefore total cost price of the two watches is equal to cost price of the first watch which is $40. So $40 plus cost price of the second watch which is $60 and this is equal to $100. Now total selling price of the two watches is equal to $48 plus $48 since both the watches are sold at $48 each. This is equal to $96. Now the net loss is equal to total cost price which is $100 minus total selling price which is $96 and this is equal to $4 Now we have to find the game of loss percent on the whole transaction. Now loss percent is equal to loss upon cost price into $100. So therefore loss percent in this case is equal to net loss which is $4 upon cost price which is $100 into $100 and this is equal to 4%. So the final answer is loss percent on the whole transaction is equal to 4% with this we end our session. Hope you enjoyed the session.