Answer:
$557.55
Explanation:
Missing word "The interest rate is 16% per year"
Present Value of annuity of 1 = (1-(1+i)^-n)/i
Where, i = 16%, n=15
Present Value of annuity of 1 = (1-(1+0.16)^-15)/0.16
Present Value of annuity of 1 = 5.575456
Present Value of saving of electricity expense = Annual Saving * Present Value of annuity of 1 = $100.00 * 5.575456 = $557.55. So, the amount we can afford to pay is $557.55
