6. An investment of $5000.00 earns interest at 6% p.a. compounded monthly for two years. At that time the interest rate is changed to 8% compounded semi-annually. How much will the accumulated value be three and a half years after the change? 7. Determine the proceeds of $19 000 three years and three months before the due date if interest is 7.6% compounded semi-annually. 8. A debt can be repaid by payments of $1000.00 today, and $3000.00 in two years. What single payment would settle the debt three years from now if money is worth 16% p.a. compounded semi-annually? 9. Debts of $400.00, $450.00 and $500.00 are due in one yea r, eighteen months and thirty months from now respectively. Determine the single payment now that would settle the debts if interest is 8% p.a. compounded quarterly. 10. Debts of $850 due in six months, $700 due in sixteen months, and $1100 due in three years are to be settled by a single payment one year from now. What is the size of that single payment if interest is 7.5% compounded monthly? 11. Calculate the number of years for money to triple at 3.6% p.a. compounded monthly. 12. A loan of $4500.00 was repaid together with interest of $1164.00. If interest was 12 .4% compounded quarterly, for how many months was the loan taken out