问题如下图：
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解释：
这题的答案解释好怪异、是不是错了
NO.PZ2019052801000046问题如下 The borrowing rates of company X anconpany Y are follows:company X anconpany Y borrowetheir comparative aantage borriwing rate, anthen they enter into interest rate swwith eaother, what's the totsavings?A.2.5%.B.2.0%.C.1.5%.1.0%.C is correct. 考点利率互换解析总的节省成本=固定利率之差减去浮动利率之差=(10% - 8%) - [(LIBOR + 2%) - (LIBOR + 1.5%)] = 1.5%.为什么不是固定利率和浮动利率各自差的和，是用的节省成本
NO.PZ2019052801000046问题如下The borrowing rates of company X anconpany Y are follows:company X anconpany Y borrowetheir comparative aantage borriwing rate, anthen they enter into interest rate swwith eaother, what's the totsavings?A.2.5%.B.2.0%.C.1.5%.1.0%.C is correct. 考点利率互换解析总的节省成本=固定利率之差减去浮动利率之差=(10% - 8%) - [(LIBOR + 2%) - (LIBOR + 1.5%)] = 1.5%.请问由于Libor未知。没法比较固定和浮动利率的绝对值，预期不同才会互换，看不出预期和利率趋势。
company X借固定，浮动都比Y利率低，为什么会互换呢？记得老师讲的相对优势，才有互换借
