7. A company issues 10 bond certificates with a face value of $5000 each that matures in 12 years. Interest on the bonds is 7.5% payable semi-annually. What is the issue price of the bonds if the bonds are sold to yield 6.5% compounded semi-annually? 8. A deposit of $11000 earns interest at 8.5% p.a. compounded quarterly. After two-and-a-half years, the interest rate is changed to 5% compounded monthly. How much is the account worth after 6 years? 9. How long does it take for money to double at 8% compounded quarterly