Kautilya's Arthashastra 3.13.28

3.13.28

karṣakaḥ sasyānāṃ gopālakaḥ sarpiṣāṃ vaidehakaḥ paṇyānām ātmanā vyavahṛtānāṃ daśabhāgam asambhāṣitavetano labheta //

Neighbours shall know the nature of agreement between a master and his servant. The servant shall get the promised wages. As to wages not previously settled the amount shall be fixed in proportion to the work done and the time spent in doing it (karmakálánurúpam = at the rate prevailing at the time.) Wages being previously unsettled, a cultivator shall obtain 1/10th of the crops grown, a herdsman 1/10th of the butter clarified, a trader 1/10th of the sale proceeds. Wages previously settled shall be paid and received as agreed upon.