How much more money should be invested now in order to receive $1,250.00 at the beginning of each month for 10 months instead of $260.00 at the beginning of each month for 30 months? Assume an interest rate of 5.00% compounded annually.

How much should Robert's dad invest in a savings account today, to be able to pay for Robert's rent for the next five years, if the rent is $450, payable at the beginning of each month? The savings account earns 3.26% compounded monthly.