A firm considering the installation of an automatic data processing unit to handle some of its accounting operations. Machines for that purpose may be purchased for P20,000, or maybe leased for P8,000...

A firm considering the installation of an automatic data processing unit to handle some of its accounting operations. Machines for that purpose may be purchased for P20,000, or maybe leased for P8,000 for the first year and P1,000 less every year now and then until the end of the 4th year. If money is worth 15%, is it advisable to rent or buy the machine?