The stock of such corporation shall not be sold at less than its par value. Twenty percent (20%) of the par value of the stock subscribed for shall be paid in before the corporation shall commence business, and the remainder of such subscriptions shall be paid from time to time upon call of the directors. No certificate of stock shall be issued to any person until the full amount of the subscription therefor shall have been paid. No person shall become a shareholder except by consent of the board of directors. Not more than ten percent (10%) of the stock outstanding at any time, and not more than Three Thousand Dollars ($3,000.00) in par value, shall be held by or for one person, firm or corporation.