Each person operating a warehouse or yard for the storage of cotton for compensation shall pay a license tax to the state as follows: Every such warehouse storing not more than 5,000 bales in the preceding calendar year, $20; more than 5,000 and not more than 10,000 bales, $40; more than 10,000 and not more than 15,000 bales, $60; more than 15,000 and not more than 20,000 bales, $100; more than 20,000 and not more than 30,000 bales, $150; more than 30,000 bales, $200.