Mitchell was supposed to pay Benjamin $$4,300,6$ months ago, and $$800,5$ months from now. If he wants to reschedule these payments with two payments, one payment of $$3,500$ today and the balance $3$ months from now, calculate the balance amount.

Assume that the simple interest charged is $3\mathrm{.}75\%$ p$.$a$.$ and the agreed focal date is $3$ months from now.