Suppose that for a company manufacturing calculators, the cost, revenue, and profit equations are given by C= 80,000 + 40x, R=200x - P=R-C 20 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 4,000 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.)

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