Answer:
If the interest rate decreases, you will be able to pay back the loan in only 58 months, which is 27 months less than with the higher interest rate.
Explanation:
I prepared an amortization schedule using the 21.8% rate, an it would take 85 months to pay of your debt completely. But if the interest rate decreases to 12.4%, it will take you only 58 months.