Profit refers to the percentage of the sales price. In other words, you have to multiply the sales price by the profit rate to calculate the profit.

For example, if you buy a commodity with a price of 100 yuan, and you want the profit rate to reach 5%, please note that the profit rate is 5%, not 5 yuan, then your purchase price is equivalent to 95% of the sales price, so as to ensure the profit rate is 5%. So, you have to use 100/0.95 instead of 65438+.

Because: sales price = purchase price+profit.

And because: profit = selling price * interest rate.

So: sales price = purchase price+sales price * profit rate.

So: sales price-sales price * profit rate = purchase price

So: sales price *( 1- profit rate) = purchase price.

So: sales price = purchase price /( 1- profit rate)