Arthashastra
परार्ध्यानां पणो वेतनं, मध्यमानाम् अर्ध पणः, प्रत्यवराणां पादः, स्थूलकानां माषक द्वि माषकं, द्वि गुणं रक्तकानाम् ॥
For washing the best garments, the wages shall be one pana; for those of middle quality, half a pana; and for those of inferior quality ¼th of a pana. For rough washing on big stones, the wages shall be ⅛th of a pana.
english translation
parArdhyAnAM paNo vetanaM, madhyamAnAm ardha paNaH, pratyavarANAM pAdaH, sthUlakAnAM mASaka dvi mASakaM, dvi guNaM raktakAnAm ॥
hk transliteration by Sanscript