Answer:
At least $500
Explanation:
Since no interest is charged on any loan paid fully within 14months, if Denise got a loan of $6500 to buy a car, then denise must pay in less than 14months in order for him not to be charged interest.
Assuming Denise paid all the loan within 13months, then for him not to be charged any interest on loan, he must he able to pay at least $6500/13 which is equivalent to $500 every month.