Suppose you put $2000 from your earnings next summer into a stock market mutual fund, where your money will earn interest at an average rate of 7% per year in the future. (This is approximately equal to the average rate of return on stock market investments in past decades.) The Rule of 70 says that when you retire, 50 years later, your mutual fund will be worth about O $24,000. O $10,000. O $140,000. O $64,000.