Answer:
It is better to buy an energy efficient model for $ 1700.
Explanation:
It is better to buy an energy efficient model for $ 1700 because at the end of five years its costs will be less than $ 1500. It saves $ 45 each year and that would save $ 45*5 = $ 225 at the end of five years. That would result in low costs as $ 1700- $ 225= $ 1475 which is less than $ 1500.
Buying $1500 is not a smart choice because then it would add up to expenses . Expenses for $ 45 each year would result in $225 in five years that would add up to be $ 1725 which is higher than $ 1700.