Since she was 25, Jenna has been saving $5,000 each year in her IRA. Her IRA earns a 6% return on average. If that continues, she will have over $870,000 in savings by age 65, enough for a retirement income of around $65,000 a year. Jenna figures that $60,000 is more than enough, so she wants to retire early at age 62. She calculates that her savings will only be $15,000 less, since she saves just $5,000 a year. Give a reason why Jenna’s calculation is incorrect and explain your answer?