Answer:
19.13 years
Explanation:
Use following formula to calculate the time required
Future Value = Present value x ( 1 + rate of return )^number of years
FV = PV ( 1 + r )^n
$175,000 = $40,000 ( 1 + 0.09 )^n
$175,000 / $40,000 = ( 1 + 0.09 )^n
4.375 = ( 1.09 )^n
Log 4.375 = n log 1.09
n = Log 4.375 / log 1.09
n = 17.13 years
Time to wait from now = 17.13 + 2 = 19.13 years