### Home > CALC > Chapter 6 > Lesson 6.1.2 > Problem 6-23

6-23.

Revenue = (profit)(number sold)

Calculate the current revenue:

Profit: $99 - $63

Number sold: 23

Adjust the current revenue equation:

Let *x* = the number of times the price is decreased by $2.

*R*(*x*) = (36 − 2*x*)(23 + 5*x*)

Optimize (that is, use derivatives to find the optimal value of *x*). But note, the question is asking about price, not *x*.