Answer:
Benjamin has purchased a $105,000 home with a 30-year mortgage at 4.75%.
=>Total amount of mortgage:
M = 105000 x ( 1 + 4.75/100)^30 = 422483.98$
If he were to make this payment each month, he would need an amount of time to pay off his mortgage:
T = 422483.98/1000 =422.5 months = 35.2 years
Hope this helps!
:)