Julie has three free hours on her saturday afternoon and two things she wants to do. first, she wants to complete the math assignment that is due on monday for school because she has no time to do it on sunday. secondly, she wants to go get coffee with her best friend, carol. julie decides to spend two hours completing her math assignment. what is the marginal cost of julie’s decision? a. she can only spend one hour with carol. b. she will get a good grade on her math assignment. c. she can only spend two hours with carol. d. she will have to rearrange her sunday schedule to finish the math assignment.