Answer:
Assuming that you pay back an equal amount each month and that the payment will be completed by the end of the third month.
500/3 = 166.6666666
So you will be paying back $166.6666666 each month.
$333.3333333 for the first two months.
$166.6666666 the third month.
These are the exact numbers but you should probably round them to make it simpler in your answer.