Suppose that for a company manufacturing calculators, the cost. revenue. and profit equations are given by 2 X C=70,000+30x, R=300x- E, P=R-C 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. A) Costs are V at the rate of $ per week at this production level. (Simplify your answer.)