9. Determine the simple interest rate if $780 in interest is earned on a $312 000 investment after 8 weeks. [1] 10. Determine the amount due if $5400 is borrowed for 4 years at 9.4% compounded annually. [1] 11. Determine the total value of an investment of $80 000 after 6 years at 6.7% compounded weekly. [2] 12. Determine the interest earned on an investment of $565 after 450 days at 2.4% compounded daily, [2] 13. Determine the amount borrowed if $13327.44 must be paid back after 9 years at 6% compounded monthly. [2]