As per the question, Jeffrey borrowed $12251, and has to pay a 9% of interest. So, if you add the 9% to the original amount, i.e, $12251, it is 13353.59. And since he has to pay it in installments, it should be paid within 3 years, if possible by him. So if he pays it within 3 years time, then:

So, the original amount that Jeffrey must repay every month is 370.9