Answer:
The answer is "Option b".
Explanation:
In this scenario, the second option, which would be the percentage within each transaction that's also interest instead of the full amount, would've been lower if the rate of interest were lower because interest-related transactions would have been higher at lower rates and conversely, as opposed to the main refunds.
Answer
The answer and procedures of the exercise are attached in the following archives.
Explanation
You will find the procedures, formulas or necessary explanations in the archive attached below. If you have any question ask and I will aclare your doubts kindly.