Suppose you currently earn $23,000 a year. You are considering a job that will increase your lifetime earnings by $230,000 but that requires an MBA. The job will mean also attending business school for two years at an annual cost of $28,000. You already have a bachelor's degree, for which you spent $75,000 in tuition and books. What are the opportunity costs, the MC, and MB in this problem? What would you do?