 Hello and welcome to the session. In this session we will discuss some results on selling price and cost price. First of all we suppose that the profit percent, the equator, R percent below profit is equal to the selling price that is Fp minus the cost price which is Cp, the selling price Fp is equal to the profit plus this equation 1. Now we have profit percent is equal to the Cp and this more multiplied by 100. This gives us Fp is equal to the profit percent into the cost per Cp and this whole upon 100 you can say the profit is equal to 100 since profit percent is R percent so R upon 100 into the cost price Cp 3 equation 2. Now equations 1 we get the selling price Fp is equal to 100 multiplied by the cost price Cp and this whole plus the cost price. We have substituted the value of this profit in equation 1 where we get the selling price Fp is equal to 1 plus R upon 100 and this whole multiplied by the cost price Cp. The selling price Fp is equal to 100 plus R upon 100 and this whole multiplied by the cost price Cp. Let this be the result. Now this formula could be used to find out the selling price of an article when given the cost price and the profit percent. R could be the profit percent. Now from this formula we have the cost price Cp is equal to the selling price Fp multiplied by 100 and this whole upon 100 plus R that is the profit percent. Let this be the result. This formula could be used to find out the cost price of an article when given the selling price and the profit percent. That is we have this R here is the profit percent plus percent be equal to R percent but loss is equal to the cost price Cp minus the selling price Fp and from here we have the selling price Fp is equal to the cost price minus loss. Let this be equation 3. We also know that loss percent is equal to loss upon the cost price Cp and this whole multiplied by 100 where we get loss is equal to the cost price Cp into loss percent and this whole upon 100. Now we have taken loss percent as R percent so we now have loss is equal to the cost price Cp into R upon 100. Let this be the result. Now from equations and for that is we substitute the value of this loss in equation 3. So we get the selling price Fp is equal to the cost price minus loss that is cost price into R which is the loss percent upon the selling price Fp is equal to 1 minus R upon 100 and this whole multiplied by the cost price. So further we get the selling price Fp is equal to 100 minus R upon 100 and this whole multiplied by the cost price Cp could be used to find out the selling price when the cost price percent are given to us that is where we have R as the loss percent but the cost per Cp is equal to the selling price Fp multiplied by 100 this whole upon 100 minus R which is the loss percent. Let this be result D out the cost price of an article given the selling price and the loss percent where this R is the loss percent. For example Fp and the profit percent be equal to 25 percent then we need to find the cost price television set which is not given to us so we can use this result B to find out the cost price of the article 100 plus the profit percent R. We have Cp is equal to 500 into 100 upon 125. Question that is we can also find the cost price of the television set using another method that is the unitary method. We suppose 100 dollars were given the selling price of the television set percent 15 dollars then the cost price on 125 dollars equal to 100 upon is equal to 100 dollars. Now either the cost price or the selling price of an article given the profit or the loss percent cost price.