Samantha plans to save $100 per month for the next 30 years to have a nest egg for retirement. Her sister, Sally, has decided to wait 15 years and start saving $200 per month for half the time figuring she will do at least as well as her sister with the strategy. They both invest in an account with an APR of 2.25%.
How much did Sally “lose” by starting 15 years later?