To find out how much money Reem has after paying back her friend, we start with her total earnings and subtract the amount she owes.
Reem's earnings: $43.78
Amount owed to her friend: $15.25
Now we calculate her remaining amount after paying her friend:
Remaining amount = Earnings - Amount owed
Remaining amount = $43.78 - $15.25
Calculating this gives:
$43.78 - $15.25 = $28.53
So, after paying her friend back, Reem has $28.53 left.
The correct answer is: $28.53.