STUCK between 2

[complicated]

A company knows that unit cost C and unit revenue R from the production and sale of x units are related by

Find the rate of change of revenue per unit when the cost per unit is changing by $10 and the revenue is $2000.


The first time I did this problem, I got $306.20 and the second I got $528.10. Sonow I am drawing a blank because my book shows example problems and I did it like they showed and came up with 2 different answers.

Does anyone know of any online resources that could help me. My logic is maybe I can find one more example, thus helping me deturmine if any of my answers are correct.

 

[stapel]

A company knows that unit cost C and unit revenue R from the production and sale of x units are related by C = [R² / 300 000] + 3 062. Find the rate of change of revenue per unit when the cost per unit is changing by $10 and the revenue is $2000.

The first time I did this problem, I got $306.20 and the second I got $528.10.

How did you "get" these values?

Please reply showing your work and reasoning.

Thank you.

Eliz.