Any person who fails to obtain a current decal within 30 days of the date the decal is required as provided in this chapter, shall be liable for a penalty of 20 percent of the fee in addition to the fee. The penalty shall be paid at the same time and in the same manner as the flat fee; and such penalty shall be deposited by the Liquefied Petroleum Gas Board in the State Treasury, to the credit of the Liquefied Petroleum Gas Board Fund.