(1) With respect to a consumer loan made pursuant to a revolving loan account, a supervised financial organization permitted to establish revolving loan accounts may contract for and receive a loan finance charge not exceeding that permitted in this section.

(2) A loan finance charge may be made in each billing cycle which is a percentage of an amount not exceeding the greatest of:

(a) The average daily balance of the debt,

(b) The balance of the debt at the beginning of the first day of the billing cycle, less all payments on and credits to such debt during such billing cycle and excluding all additional borrowings during such billing cycle, or

(c) The median amount within a specified range within which the average daily balance of the debt or the balance of the debt at the beginning of the first day of the billing cycle, less all payments on and credits to such debt during such billing cycle and excluding all additional borrowings during such billing cycle, is included. A charge may be made pursuant to this subdivision only if the lender, subject to classifications and differentiations he may reasonably establish, makes the same charge on all balances within the specified range and if the percentage when applied to the median amount within the range does not produce a charge exceeding the charge resulting from applying that percentage to the lowest amount within the range by more than eight percent of the charge on the median amount.

(3) If the billing cycle is monthly, the loan finance charge may not exceed one and one-half percent on the first $750 of unpaid principal balance and one percent on the unpaid principal balance in excess of $750. If the billing cycle is not monthly, the maximum charge is that percentage which bears the same relation to the applicable monthly percentage as the number of days in the billing cycle bears to thirty. A billing cycle is monthly if the billing statement dates are on the same day each month or do not vary by more than four days therefrom.

(4) Notwithstanding subsection (3), if there is an unpaid balance on the date as of which the loan finance charge is applied the lender may contract for and receive a charge not exceeding 50¢ if the billing cycle is monthly or longer, or the pro rata part of 50¢ which bears the same relation to 50¢ as the number of days in the billing cycle bears to thirty if the billing cycle is shorter than monthly, but no charge may be made pursuant to this subsection if the lender has made an annual charge for the same period as permitted by the provisions on additional charges.

(5) As an alternative to the loan finance charge allowed by section one hundred six, subsection (3) of this article, from the effective date of this subsection until and including July 1, 1982, with respect to a consumer loan made pursuant to a revolving loan account, if the billing cycle is monthly, a supervised financial organization permitted to establish revolving loan accounts may contract for and receive a loan finance charge not exceeding one and one-half percent on the unpaid principal balance. If the billing cycle is not monthly, the maximum charge is that percentage which bears the same relation to the applicable monthly percentage as the number of days in the billing cycle bears to thirty. A billing cycle is monthly if the billing statement dates are on the same day each month or do not vary by more than four days therefrom.