 Hello and welcome to the session. In this session we discussed the following question which says the cost price of 10 candles is equal to the selling price of 15 candles, find the loss percent. Before proceeding with the solution, let's recall the formula for loss percent. This is equal to loss upon the cost price Cp into 100 percent. And we have loss is equal to the cost price Cp minus the selling price Sp. This is the key idea to be used in this question. Now let's move on to the solution. First, we assume that the cost price Cp of one candle be equal to rupees X. Then we have cost price Cp of 15 candles is equal to rupees 15 X. And also the cost price Cp of 10 candles would be equal to rupees 10 X. Now in the question we have that the cost price of 10 candles is equal to the selling price of 15 candles. So now we say that the selling price Sp of 15 candles is equal to the cost price Cp of 10 candles and this is equal to rupees 10 X. That is we now have selling price of 15 candles is equal to rupees 10 X and also cost price of 15 candles is equal to rupees 15 X. Now you see the cost price of 15 candles is greater than the selling price of 15 candles. So this implies there is a loss and we know that loss is equal to Cp minus Sp. So we get loss is equal to Cp of 15 candles that is the cost price of 15 candles which is rupees 15 X minus the Sp of 15 candles that is selling price of 15 candles which is rupees 10 X and this is equal to rupees 5 X. So there is a loss of rupees 5 X. Now loss percent is equal to from the key idea we have loss percent is equal to loss upon Cp into 100 percent. So that is loss percent is equal to loss which is 5 X upon Cp that is 15 X into 100 percent. Now this X and X gets cancelled and 5 3 times is 15 so this is equal to 100 upon 3 percent which is equal to 33 1 upon 3 percent is the loss percent. Hence our final answer is 33 1 upon 3 percent. So this completes the session. I hope you have understood the solution for this question.