Suppose that for a company manufacturing calculators, the costr revenue, and profit equations are given by 2 x C=T0,000+30x, R=300x E, P=RC where the production output in 1 week is x calculators. If production is increasing at a rate of 400 calculators per week when production output is 6,000 calculators. Find the rate of increase (decrease) in cost, revenue, and profit. :I) A} Costs are 7 at the rate of $ per week at this production level. (Simplify your answer.)