Fatimah pays monthly rent of $520 for her townhouse. If she bought the property, the mortgage loan, property tax, and utilities would cost her $920 per month. Using the current mortgage loan rate of 6.6% compounded semi-annually, calculate how much money Fatima could accumulate over 10 years if she continues to rent and invests the $400 per month difference.
a. $77,085
b. $47,845
c. $67,768
d. $56,299