7-36. The expected annual maintenance expense for a new piece of equipment is $10,000. This is Alternative A. Alternatively, it is possible to perform the maintenance every fifth year at a cost of $50,000 (Alternative B). In either case, maintenance will be performed in the fifth year so that the equipment can be sold for $100,000 at that time. If the MARR is 15% per year (before income taxes), which alternative should be recommended in each of these situations? (7.10)

a. Before income taxes are considered.

b. After income taxes are considered when t = 40%.

c. Is there a different selection before and after income taxes are considered?