tuitionpayenroll.com and CC "convenience fee"

[toopooor]

DD's college sent a letter to enroll in a payment plan - cost is $55 to enroll and they say there is a per payment fee if you use a CC but don't say what it is, only that it varies with the amount of the payment. I'm debating between charging the full amount in the fall and BT to a low int card (to raise the HC on my no limit cards), doing the payment plan from my checking acct, or getting a plus loan to fill out my CR with a loan.

 

If the fee is reasonable, i'll just charge the tuition monthly... but none of the documents say how much it is. Since it's run by sallie mae, i suspect it might be the full transaction fee they are charged - which will be between 1 and 3% of the payment amount - if so, it's one option i'd cross off.