Answer:
$868,331.25
Step-by-step explanation:
price of house = P
principal of loan = P x (1 - 20%) = 0.8P
using the present value of an annuity formula:
present value of the loan = monthly payment x annuity factor
monthly payment = $3,100
annuity factor (PV, 0.2875%, 360 periods) = 224.0854839
present value of the loan = $3,100 x 224.0854839 = $694,665 = 0.8P
total value of the house = P = $694,665 / 0.8 = $868,331.25