 Hello and welcome to the session. In this session we discussed the following question which says by selling 50 lemons a vendor losses a sum equal to the selling price of 5 lemons find is loss percent. First let's recall the formula for loss this is equal to cost by CP minus the selling price SP and loss percent is equal to loss upon the cost by CP this whole into 100 percent. This is the key idea to be used in this question. Now let's move on to the solution. Now we know that loss is equal to cost price minus selling price so where loss would be equal to the cost price of 50 lemons minus the selling price of 50 lemons but we have that the vendor losses a sum equal to the selling price of 5 lemons so in place of loss we can write selling price of 5 lemons and this is equal to the cost price of 50 lemons minus the selling price of 50 lemons. This means that selling price of 50 lemons plus selling price of 5 lemons is equal to the cost price of 50 lemons. This means selling price of 55 lemons is equal to the cost price of 50 lemons. Now we assume let the cost price CP of 1 lemon be equal to rupees X so then we have cost price of 55 lemons is equal to rupees 55 X and also cost price of 50 lemons is equal to rupees 50 X. Now since we have selling price of 55 lemons is equal to cost price of 50 lemons which we have found to be equal to rupees 50 X so this means that selling price of 5 lemons is equal to rupees 50 X. Now you observe that cost price of 55 lemons is rupees 55 X and selling price of 55 lemons is rupees 50 X that is we have the cost price is greater than the selling price then we say that there is a loss. Loss would be equal to cost price minus the selling price that is equal to rupees 55 X minus rupees 50 X which is equal to rupees 5 X. Now we have got loss equal to rupees 5 X so now loss percentage is given by loss that is 5 X upon the cost price of 55 lemons which is 55 X this whole into 100 this cancels with X 5 11 times is 55 so this is equal to 100 upon 11 and this is equal to 9 1 upon 11 percent is the loss percent hence our final answer is 9 1 upon 11 percent so this completes the session hope you have understood the solution for this question.