Assume Calvin invests in a mutual fund that earns about 10% annually from dividend income and capital gains. Given that Calvin wants to receive $1,000 to $1,500 a month from his mutual fund, what would be the size of his investment account 5 years from now? How large would the account be if the fund earned 15% on average and everything else remained the same? How important is the fund's rate of return ot Calvin's investment situation?