Payments of $$2,700$ due $18$ months ago and $$3,500$ due in three years are to be replaced by an equivalent stream of payments

consisting of $$2,400$ today and two equal payments due two and four years from now. If money can earn $9\mathrm{.}75\%$ compounded

semiannually, what should be the amount of each of these two payments? $($Do not round intermediate calculations and round your

final answer to $2$ decimal places.$)$