For the purpose of this section, one month shall be that period of time from any date in a month to a corresponding date in the next month and, if there is not a corresponding date, then to the next day of the next month, and a day shall be considered one thirtieth of a month when computation is made for a fraction of a month.
Provided, however, that the scheduled payments are in amounts equal to or greater than forty dollars ($40) per month, inclusive of the installment account handling charge. The acquisition charge and the installment account handling charge may be calculated for the term of the contract and added to the amount of the principal. The acceptance or payment of charges on loans made under this subsection shall not be deemed to constitute payment, deduction, or receipt thereof in advance nor compounding under this subsection.
Ala. Code § 5-18-15 (1975)