Darham was a silver coin at that time
Surah Yuusuf(Joseph) - 12
‘A-‘uu-zu Billaahi minash-Shay-taanir- Rajiim.
(I seek refuge in God from Satan the outcast.)
(In the name of God, the Beneficent, the Merciful.)
20. And they sold him for a low price, a number of silver coins, and they attached no value to him. 20. Wa sha-rawhu bi-samanim- bakh-sin- daraa-hima ma’-duudah. Wa kaanuu fiihi minaz-zaahi-diin.
Bakh-sin – (low, deficient, little, less, few, reduced), this word means “very little, very less”. Like the same, a word “laa yub-kha-suun” has pass in Surah Huud, which means “they will not be wronged”.
Daraa-hima – it is plural of darham, which was a silver coin of those days, and which may be estimated as equal to “one $” at this time. Daraa-hima ma’-duudah – (few dollars).