The total liabilities to any industrial loan institution of any person, corporation, company, or firm for money borrowed, including in the liabilities of the company or firm the liabilities of the several members thereof, shall at no time exceed twenty percent (20%) of the actually paid-up capital and surplus of the industrial loan institution. However, the discount of bona fide bills of exchange or acceptances drawn against actually existing values and the discount of commercial or business paper actually owned by the person, corporation, company, or firm negotiating them shall not be considered money so borrowed.