please use excel

Question 4) Calculate PV of a lump sum if: FV=$68,000;n=8%;n=7 years; compounded annually FV=$68,000;n=8%;n=7 years; compounded quarterly FV=$68,000;n=8%;n=7 years; compounded monthly Question 5) Calculate PV of an annuity if: Annual PMT on Dec 31=$24,000;r=6%;n=20 years Calculate PV of an annuity due if: Annual PMT on Jan 1=$24,000;r=6%;n=20 years Question 6) Calculate PV of an annuity if: Monthly PMT on last day of each month =$2,000;r=6%;n=2 Calculate PV of an annuity due if: Monthly PMT on first day of each month =52,000;r=6%;n=2