Create a formula for the dependence of price

Hello, hello.

Offering remote work. We need to build a formula for the dependence of price on size by example. There is a calculator that calculates the cost of the product based on its area. The higher the area of the product, the lower the cost of m2.

It is necessary to build a formula that would calculate the final cost of the product based on its area according to the dependence on the example. As a base value, m2 can be taken as the first value.

The data file attached to the letter.