Anastasia and Bartek are at it again. This time Anastasia saves $240 at the end of each month for 10 years, and then saves $480 per month for the next 10 years. Meanwhile Bartek saves $480 at the end of each month for 10 years, and then saves $240 per month for the next 10 years The interest rate is 2.5% compounded annually. a) Who has more money at the end of 20 years? b) Prove that your answer to a) will always be true for any interest rate r as long as r > 0