Two friends, call them Stella and Lizzie both have retirement accounts. Stella plans on retiring in 7 years and Lizzie in 10 years. Stella has been making $300 monthly deposits for the last seven years and, from this day forward, will increase this amount by 25%. Stella also put in a lump sum of $4,500 initially, a rollover from a 401(k) account with another employer. Lizzie started her retirement account one year ago with an initial deposit of $500. Now, she plans to make $290 monthly payments until retirement. Assume Stella earns 5.3% and Lizzie earns 8.4%, both compounded monthly. What is the difference in the retirement amounts of Stella and Lizzie?