• Proficient-level: "What is the future value of a $1,000 annuity payment over five years if interest rates are 9 percent?".
• Recalculate the future value at 8 percent interest, and again, at 10 percent interest.
• Proficient-level: "What is the present value of an $800 annuity payment over six years if interest rates are 10 percent?" .
• Recalculate the present value at 9 percent interest, and again, at 11 percent interest.

Please show the work