The above items need not be stated in the sequence or order set forth. Additional items may be included to explain the calculations involved in determining the stated time balance to be paid by the buyer. Notwithstanding any provision of this chapter to the contrary, in any contract evidencing the sale of a commercial vehicle, the statement of the amount of the finance charge (item (h) hereof) and the amount of each installment (item (i) hereof) may be calculated using the finance charge rate applicable to the transaction as of the date of execution of the contract, notwithstanding the fact that such finance charge rate may increase or decrease over the term of the contract according to any formula or index set forth in the contract; provided, however, that under no circumstances may the variable rate under such contract at any time exceed the finance charge limitations found in Section 63-19-43, of this chapter.
Miss. Code § 63-19-31