Marginal cost is the change in total cost resulting from unit change in.
• a output
• a input
• both a and b
• none of these

The change in the total product resulting from a change in a variable input is:

IF the marginal cost is defined as the rate of change of total cost with respect to the number of units of the product, The marginal cost of producing x units of a product is given by marginal cost =2xsqrt(x+5) . The cost of producing 4 units of the product is Rs 314.40 . Find the cost function.