solano carriers finds that its revenue in dollars from the sale of suitcases is given by the following equation: R(x)=0.007x^3-0.5x^2+200x. the variable x represents the quantity of suitcases sold.

A. Determine the company average rate of change in revenue over the interval [20,25] suitcases.

B. determine the company instantaneous rate if change.

C. Calculate the instantaneous rate of change in the revenue when 25 suitcases are sold.