7.1.1. For the purposes of sections 6 and 7, where the vendor of a movable property accepts, in full or partial consideration for the sale of the property, a coupon that entitles the purchaser to a reduction of the price of the property equal to a fixed dollar amount specified in the coupon and the vendor can reasonably expect to be paid an amount for the redemption of the coupon by another person, the purchase price of the property so sold is deemed to be equal to the price that would be determined if the coupon were not accepted, except as regards the application of section 13.