Using the real-life application below, determine the following:

The revenue in dollars from the sale of x planter boxes is given by

R(x) = 20x - 0.02x²

1) Explain how to find the change in revenue if production is changed from 50 planters to 400 planters? Be certain to show your work when providing an explanation of your answer.

2) Explain how to find the average rate of change in revenue for this change in production? Be certain to show your work when providing an explanation of your answer.