a) You invest $4,000 at the end of every year for 35-years of your career. If you want $850,000 in savings at retirement, what interest rate must the investment eam? [If you use goal seek you must show the screen shot] b) Given the retirement cashflows below, what is the equivalent Future Worth at 10% interest? Tip: for future worth analysis be sure to use the right time period in the equation/function 8% year Cashflow 0 $ (500) 1 $ 250 2 $ 250 3 $ 250 4 $ 250 5 $ 250 6 $ 250 7 $ 250 8 $ 250 9 $ 250 10 $ (150) 11 $ 250 12 $ 250 13 $ 250 14 $ 250 15 $ 250 16 $ 250 17 $ 250 18 $ 250 19 $ 250 20 $ 220