Your buddy in mechanical engineering has invented a money machine. The main drawback of the machine is that it is slow. It takes one year to manufacture $100. However, once built the machine wi1l last forever and will require no maintenance. The machine can be built immediately, but it will cost $1000 to build. Your buddy wants to know if he should invest the money to construct it. a. If the interest rate is 9.5% per year, what should your buddy do? b. How would your answer change if the machine takes one year to build?