Molly Needs to Decide Whether to Buy a Water Heater

Essay

Molly needs to decide whether to buy a water heater for $2200 cash and enter a service contract requiring a payment of $30 at the end of every 3 months for 10 years or to enter a 10 years lease requiring a payment of $90 at the beginning of every 3 months. If the leased water heater can be bought after 10 years for $80, should Molly buy or lease the water heater, if money is compounded quarterly at 2.5%?