Answer:
0.2571 or 25.71%
Step-by-step explanation:
In this case, even though the initial amount invested is not given, it can be found by subtracting the amount by which the investment appreciated of the year-end value:

The return rate is given by the interest payed added to the amount appreciated, divided by the initial investment:

The customer's total return is 0.2571 or 25.71%