To find out how much money Reem has left after paying her friend back, you can use the following calculation:
- Amount Reem earns: $43.78
- Amount she owes: $15.25
Now, subtract the amount she owes from her earnings:
\[ 43.78 - 15.25 = 28.53 \]
So, after paying her friend back, Reem has $28.53 left.
The correct response is: $28.53