grand parent want to establish a trust fund from which their grandson can withdraw $1800 every 6 months for next 8 years, they want also that he...

grand parent want to establish a trust fund from which their grandson can withdraw $1800 every 6 months for next 8 years, they want also that he receives the remaining $5000 at that time. If the trust is invested at 7% compounded semi-annually,how large should the trust be?