steps and answer please On January 1, 2009, Antonella owed $13 , 947 to her friend Aponi, who was kind enough not to charge Antonella any interest. Each month during 2009, Antonella paid Aponi some of the money she owed. If Antonella still owed Aponi $9 , 099 on January 1, 2010, what was the average amount of Antonella's monthly payments? .