# Question: need to find instantaneous rate of change for a calculus...

###### Question details

Need to find instantaneous rate of change for a calculus application problem.

33 initial customers charging at $883.14 per customer

gain 2 new customers a year

lose $10.98/customer/year for supply cost

First find the revenue equation then the instantaneous rate of change.

my revenue function is (883.14-10.98x)(33+2x) when I take the derivative of the function, the revenue decrease each year.

Help me please. Thank you.