(c) Before a sale, contract for sale, reservation for sale or agreement for sale in the first mausoleum section or bank of underground crypts in each cemetery may be made the funds (one hundred twenty percent (120%) of construction cost) to be deposited to the preconstruction trust account shall be computed as to the section or bank of crypts and the trust account payments must be made on or before the last day of the calendar month following receipt by the cemetery company or its agent of each payment. The trust account portion of each payment shall be computed by dividing the cost of the project plus twenty percent (20%) of the cost, as computed by a licensed contractor, engineer or architect by the number of crypts in the section or bank of crypts to ascertain the cost per unit. The unit cost shall be divided by the contract sales price of each unit to obtain a percentage which shall be multiplied by the amount of each payment. The formula shall be computed as follows: Cost plus twenty percent (20%) divided by number of crypts = cost per unit
Cost per unit divided by contract sales price = percentage
Percentage x payment received = deposit required to preconstruction trust account.