ABC Company must choose between two types of machines.

Machine A costs $500,000, will last for three years, and will require $70,000 in maintenance each year

.

Machine B costs $750,000, will last for four years, and will require $30,000 in maintenance each year.

Maintenance costs for machines A and B occur at the end of each year.

The appropriate discount rate is 10 percent per year. Which machine should ABC Company purchase?