return on the margin transaction

课件1.6 position 中的Position Practice 中第二小问求 the investor’s return on the margin transaction if the stock is sold at the end of one year. 其中答案把Dividend 包括在了return里面。但是我们在 Payment-in-lieu 的知识点中说the received dividends must be paid back to the security lender. 请问为什么dividends会被算到return on the margin transaction.