Jennifer has been saving for college for 57 months. The first month, she saved $11. She was able to save more money each month than the month before. She ended up saving $19,779.00. How much more did she save each month?
The AVERAGE she saved each month (assuming she accrued NO interest ) is 19779/57=347 dollars/mo
This is an arithmetic series, where:
1st. term=11
Number of terms=57
Sum of all terms=19,779
Common difference=?
From all the above, we can calculate that the common difference=12
So, Jennifer was adding $12 to her savings every month, so that she would have: 11, 23, 35, 47, 59, 71, 83, 95, 107.........etc.
