The marginal cost of a product can be thought of as the cost of producing one additional unit of output. For example if the marginal cost of producing the 50th product is $6.20, it cost 6000 $.20 to increase production from 49 to 50 units of output. Suppose the marginal cost C (in dollars) to produce X Thousand MP3 players is given by the function c(x)=x^2-160+8100. A. How many players should be produced to minimize the marginal cost? B. What is the minimum marginal cost