A company is increasing production of math-brain protein bars at a rate of 200 cases per day. All cases produced can be sold. The daily demand function is given by p(x) = 80 x/200

, where x is the number of cases produced and sold, and p is in dollars. Find the rate of change of the revenue with respect to the time in days when the daily production is 800 cases.

14,300 dollars per day

14,000 dollars per day

15,300 dollars per day

14,400 dollars per day

15,000 dollars per day