Data:
Initial amount: $10,000
5% simple interest
Time: 2 years
You can use the next formulas to find the amount Alexa owe her aunt since the borrow is with simple interest:

F is the final amount
A is the initial amount
I is the interest
r is the rate of interest
t is the time in years
Find first the Interest:

Find the final amount:

Then, Alexa owe her aunt after 2 years an amount of $11,000