es Suppose the marginal benefit of writing a contract is $90, independent of its length. Find the optimal contract length when the marginal cost of writing a contract of length Lis: Instruction: Enter your responses rounded to two decimal places. a. MC(L) = 20 + 4L. b. MC(L) = 30 + 2L. c. What happens to the optimal contract length when the marginal cost of writing a contract declines? (Click to select)