Answer:
after one month = 100*.05=
$5 earned + $100 already there= $105
after 2 months = $105*.05=
$5.25 earned + $105 already there= $110.25
after 3 months = $110.25*.05=
$5.51 earned + $110.25 already there=
$115.76 is how much she'll have in the account after 3 mos.
