Abd al-Karim narrates: Sayyiduna Ali (may Allah be pleased with him) and Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said, concerning a slave woman who has been forced: If she is a virgin, a tenth of her price is to be paid, and if she is previously married (thayyib), a twentieth of her price is to be paid.
Al-Tabarani recorded it with the same chain as the preceding one, and that chain is munqati' (broken).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الحدود والديات / 10628