Wilson: [他們全對，原因問題沒指明畫本身的價值，各人都以自己的標準去計算甲的利益，畫家共收了一百一十元，甲定了成本是一百元，所以認為賺了十元；乙認為畫值八十元，所以甲賺了卅元；丙卻認為畫值九十元，甲賺了二十元。這是一個典型的羅生門。

They are all correct. The question didn't defined the price of the art work.  So each of them calculate the profits according to their standard. John received $110 in total. John assumed the art work worth $100, so he earned $10; Peter thought the art work worth $80, so John earned $30; Ken believed the art work worth $90, so John would be earning $20.]