Your friend 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 $800. However, once built, the machine will last forever and will require no maintenance. The machine can be built immediately, but it will cost $8,000 to build. Your friend wants to know if he should invest the money to construct it. If the interest rate is 4.5% per year, what should your friend do?

If possible, please show work on spreadsheet.