A company is manufacturing a new digital watch and can sell

A company is manufacturing a new digital watch and can sell all it manufactures. The cost (in dollars) is given by C(x)=5,000 + 2x where the production output in one day is x watches. If production is increasing at 5 watches per day when production is 375 watches per day, find the rate of increase in cost. $75 per day $10 per day $5 per day $175 per day $75