Answer:
a. How much will Ruby’s IRA be worth when she needs to start withdrawing money from it when she retires?
the future value of Ruby's IRA = $10,000 x 21.725 (FV factor, 8%, 40 periods) = $217,250
b. How much money will she have to accumulate in her company’s 401(k) plan over the next 40 years in order to reach her retirement income goal?
she needs to accumulate $875,000 - $217,250 = $657,750 during the next 40 years
the annual contribution = FV / FV annuity factor = $657,750 / 259.057 (FV annuity factor, 8%, 40 periods) = $2,539.02 per year