The stem and leaf plot shows the amount of money saved each month for 10 months.
Stem "5" Leaf "4" means 54.
Stem "5" Leaf "5" means 55.
Stem "8" Leaf "3" means 83.
So, the savings for each month for a span of 10 months are $54, $55, $55, $60, $65, $68, $69, $71, $76 and $83.
From the given stem-leaf plot, the least monthly monthly savings is $54.
The greatest monthly savings is $83.
Hence, the sum of greatest monthly savings and least monthly monthly savings of Brad is,
Therefore, the sum of Brad's greatest monthly savings and least monthly monthly savings is $137.