Anastasia and Bartek are saving for university. They are both planning to save $100 per month (at the end of each month). However, at the end of each year, Anastasia deposits 2.5 times that amount, while Bartek misses his deposit (and saves nothing that month). The effective monthly rate is 0.4% a) How much more money does Anastasia have than Bartek at the end of 4 years? b) How much money has each of them saved? (You can do part a) without doing this part!)