4. Use Excel to answer the following question. You may use a financial calculator to check your work afterwards, but you must construct a spreadsheet yourself to calculate the answers. Submit your spreadsheet file along with your written answers. How valuable is it if a fund saves you 50 basis points (i.e. 0.5%) per year in expenses? The following gives a sense: a) If you save $40,000/year and invest at a 4.0% rate of return, how long does it take to save $2 million? b) If you save at $40,000/year and invest at 4.5%, how long will it take? c) If you have $2 million and can invest at 4%, how many dollars can you spend per year and have nothing left after 30 years? d) How much can you spend per year if you can invest at 4.5%?