Skandapurana 5.240.44

5.240.44

vṛttiśca satyānṛtajā vāṇijyavyava hārajā ..
aśītibhāgamāradyādvyājādvārdhuṣikaḥ śate ..44..

Their livelihood arises from truth and falsehood, born of trade and commerce. / An eightieth part is taken as profit by a usurer on a hundred;