Charles set up a savings fund for her son's education so that she would be able to withdraw $1,750 at the beginning of every month for the next 4 years. The fund earns 3.90% compounded quarterly. a. What amount should she deposit today to allow for the $1,750 periodic withdrawals? $66,827.62 $77,678.70 $77,930.34 $67,479.19 b. How much interest would she earn in this investment? $77,930.34 $6,069.66 $84,000.00 $6,321.30