the marginal cost (in dollars) to produce y thousand tubs of butter is given by the fuction C(y)=y^2-160y+7400 a. How many tubs should be produced to...

the marginal cost (in dollars) to produce y thousand tubs of butter is given by the fuction C(y)=y^2-160y+7400

a. How many tubs should be produced to minimize the marginal cost?

b What is the minimum marginal cost?

Please show your work so that I can understand for future problems, thank you