Question: How much did Da Vinci's Salvator Mundi sell for at the 2017 Sotheby's auction?
Answer: 它在佳士得而不是苏富比拍卖。苏富比是一项较早的私人交易的经纪人。
It was sold at Christie's instead of Sotheby's. Sotheby's was the broker for an older, private deal.