Problem 7. Sinking Funds. 10 points. Shanan is planning to retire in 24 years and wishes to withdraw $8000 per month for 20 years from her retirement account starting at that time. Ilow much must she contribute each month into a retirement account earning interest at the rate of 4.33% per year compounded monthly to meet her retirement goal? What would she need to contribute if she wanted to withdraw the same amount for 25 year? Solution: 5