PLEASE HELP WITH EXCEL IF POSSIBLE - THANK YOU!!

Calculate FV of an annuity if: Annual PMT on Dec 31=$15,000;r=9%;n=30 years (end of year) Calculate FV of an annuity due if: Annual PMT on Jan 1=$15,000;r=9%;n=30 years (beginning of year) How does this difference illustrate the importance of drawing a timeline to keep track of cashflows