Find the rate of change of total revenue, cost, and profit with respect to time.
Assume that R(x) and C(x) are in dollars.
R(x)=55x-0.5x^2, C(x)=2x+10, when x=40 and dx/dt=25 units per day.
the rate of change of total revenue is $_ per day
the rate of change of total cost is $_per day
the rate of change of total cost is $_per day