RSA 384-G:5 Interest Charges.

I. In addition to or in lieu of interest at a periodic percentage rate or rates as provided in RSA 384-G:3 and RSA 384-G:4, a bank may, if the agreement governing the revolving credit plan so provides, charge and collect, as interest, in such manner or form as the plan may provide, one or more of the following:
(a) A daily, weekly, monthly, annual or other periodic charge in such amount or amounts as the agreement may provide for the privileges made available to the borrower under the plan.
(b) A transaction charge or charges in such amount or amounts as the agreement may provide for each separate purchase or loan under the plan.
(c) A minimum charge for each daily, weekly, monthly, annual or other scheduled billing period under the plan during any portion of which