Ty recieved a separation payment of $25000 from his former employer when he was 35 years old. He invested the money at 5.5% compounded semi-annually. When he was 65, he converted the balance into an ordinary annuity paying $6000 every three months with interst at 6% compounded quarterly. For how long will the annuity continue to pay him?

The annuity will continue to pay him for __ quarterly periods.

Please aswer ASAP