NO.PZ2020021204000002
问题如下：
What is a repo rate?
解释：
A repo rate is a short-term secured lending rate. The borrower agrees to sell securities to the lender and buy them back for a slightly higher price a little later.
老师，A先将债券卖给B，A收到10元，过几天又从B手中回购，花了11元，回购利率就是（11-10）/10？
