Answer:
R=407.11$
Explanation:
Since the Marie wants to contribute equal amount per month in order to get the $3,000,000 after 40 years, therefore the future value of annuity formula shall be applied to the given question to solve the problem.
Future value of annuity=R[((1+i)^n-1)/i]
R=monthly investment to be made=?
n=number of payments involved=40*12=480
i= interest rate=10.5%/12=0.875%
Future value of annuity=$3,000,000
$3,000,000=R[((1+0.875%)^480-1)/0.875%]
R=407.11$