Toys-R-R owes $6000 due in two years with interest at 11% compounded semi-annual

Toys-R-R owes $6000 due in two years with interest at 11% compounded semi-annually and $5000 due with interest in fifteen months at 9% compounded quarterly. If the company wants to discharge these debts by making two equal payments, the first now and the second eighteen months from now, what is the size of the two payments if money is now worth 8.4% compounded monthly
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