A loan contract called for a payment after two years of $1500 plus interest (on this $1500

Question:

A loan contract called for a payment after two years of $1500 plus interest (on this $1500 only) at 8% compounded quarterly, and a second payment after four years of $2500 plus interest (on this $2500) at 8% compounded quarterly. What would you pay to purchase the contract 18 months after the contract date if you require a return of 10.5% compounded semiannually?