Answer:
$3,751.90
Explanation:
we must find the present value of both alternatives
alternative 1, keep paying $1,000 per month for 60 months
present value = monthly payment x PV annuity factor
monthly payment = $1,000
PV annuity factor = [1 - 1/(1 + 0.9167%)⁶⁰ ] / 0.9167% = 45.9136
present value = $1,000 x 45.91361 = $45,991.36
alternative 2, pau $1,050 per month for 54 months starting after 6 months
monthly payment = $1,050
PV annuity factor = [1 - 1/(1 + 0.9167%)⁵⁴ ] / 0.9167% = 42.4406
present value in 6 months = $1,050 x 42.4406 = $44,562.63
present value today = $44,562.63 / 1.055 = $42,239.46
Sally's net worth increases by $45,991.36 - $42,239.46 = $3,751.90