26. The insurance contribution exigible under the second paragraph of section 18 and sections 20 to 23 for a driver’s licence bearing one or more of classes 1 to 5 and one or more of classes 6A, 6B or 6C is the amount obtained by adjusting, in accordance with section 45, the sum of insurance contributions as follows:(1) that calculated under section 24, before adjustment under section 45;
(2) that calculated by adding together the insurance contributions for the months, including parts of months, comprised in the period for which an insurance contribution is exigible under the second paragraph of section 18 and sections 20 to 23, except for the last month. The insurance contribution for a month is calculated by applying the percentage determined under section 14 to an amount equivalent to the annual insurance contribution for the payment due year, set under section 12, before adjustment under section 45, for the holder of a licence bearing one or more of classes 6A, 6B or 6C with no demerit point.