The output is 6,000 calculators

Suppose that for a company manufacturing calculators, the cost, revenue, and profit equations are given by C = 80,000 + 40x, R= 200x - 20 P=R-C where the production output in 1 week is x calculators. If production is increasing at a rate of 500 calculators per week when production output is calculators. Find the rate of increase (decrease) in cost, revenue, and profit. A) Costs are at the rate of $ per week at this production level. (Simplify your answer.) B) Revenue is at the rate of $ per week at this production level. (Simplify your answer.) C) Profits are at the rate of $ per week at this production level. (Simplify your answer.)