Question

Suppose that for a company manufacturing​ calculators, the​ cost, revenue, and profit equations are given by...

Suppose that for a company manufacturing​ calculators, the​ cost, revenue, and profit equations are given by

C = 90,000 + 40x, R = 300x - x2 /20 , P=R-C

where the production output in 1 week is x calculators. If production is increasing at a rate of 600 calculators per week when production output is 4,000 calculators.

A) Costs are (increasing/decreasing) at the rate of $_ Per week

B) Revenue is (increasing/decreasing) at the rate of $_

C) Profits are (increasing/decreasing) at the rate of $_

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