Each cold storage plant, packinghouse, or refrigerated warehouse used for storage for hire of any food product shall pay a license fee according to the following schedule based on cubic feet of refrigerated space: Less than 25,000 cubic feet, $15; 25,000 and not over 50,000 cubic feet, $20; 50,000 and not over 100,000 cubic feet, $25; 100,000 and not over 200,000 cubic feet, $50; 200,000 cubic feet and over, $100. Operators of refrigerating pipeline for the purpose of refrigerating rooms, premises, goods, wares, or merchandise of others for profit shall pay a license tax of $75.