One year ago Radu bought a car from Aida which was to be payed for with a payment of $$300\mathrm{.}007$ months ago and $$400\mathrm{.}003$ months from now. Radu missed the first payment and now Aida wants him to settle the debt by making a single payment today equivalent to the value of the two originally specified payments. How much money would Radu have to pay Aida if money could earn simple interest of $0\mathrm{.}5\%$ per month? For full marks your answer$($s$)$ should be rounded to the nearest cent.