8. A deposit of $12000 earns interest at 7.5% p.a. compounded quarterly. After two-and-a-half years, the interest rate is changed to 3% compounded monthly. How much is the account worth after 6 years?

9. A $15350, 7.5% bond with semi-annual coupons redeemable at par in 7 years is purchased at 103.5. What is the approximate yield rate?

10. How long does it take for money to double at 9% compounded quarterly?

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