For each dealer in electric, gas, or other mechanical refrigerators, electric or gas heaters, electric or gas water heaters, electric or gas stoves, or for each electrical or gas repair shop, or electrical or gas supply shop there shall be paid a license tax as follows: In cities of 100,000 inhabitants or over, $30; in cities of 50,000 and less than 100,000 inhabitants, $20; in cities of 10,000 and less than 50,000 inhabitants, $10; and in places of less than 10,000 inhabitants, whether incorporated or not, $5.