这道题好难呀.老师可以详细讲解一下吗

NO.PZ2023052301000041问题如下 investor purchases eight-year, 6.4% annucoupon eurobonpricepansells it after six years. Assuming interest rates rise 100 bps immeately after purchase, the investor’s rate of return the enof six years is: A.lower th6.4%.B.equto 6.4%.C.higher th6.4%. A is correct. The future value of reinvestecoupon interest is= FV(0.074,6,6.4,0,0) = 46.245.The sale priof the bonthe enof six years is= PV(0.074,2,6.40,100,0) = 98.202,whiresults in a six-yehorizon yielof 6.32%, whiis lower th6.40%:B anC are incorrect, because interest rates have risen anthe investor’s investment horizon is not long enough to offset the pricline with aitionreinvestment return. 利率上升，RI上升，sell price降低。还剩两年，sell pri两年的risk较小能够被RI抵消，因此RI上升，总体利率上升？

NO.PZ2023052301000041问题如下 investor purchases eight-year, 6.4% annucoupon eurobonpricepansells it after six years. Assuming interest rates rise 100 bps immeately after purchase, the investor’s rate of return the enof six years is: A.lower th6.4%.B.equto 6.4%.C.higher th6.4%. A is correct. The future value of reinvestecoupon interest is= FV(0.074,6,6.4,0,0) = 46.245.The sale priof the bonthe enof six years is= PV(0.074,2,6.40,100,0) = 98.202,whiresults in a six-yehorizon yielof 6.32%, whiis lower th6.40%:B anC are incorrect, because interest rates have risen anthe investor’s investment horizon is not long enough to offset the pricline with aitionreinvestment return. 这个不能用老师讲的算作持有long term ，r上升 rr大于ytm吗？

NO.PZ2023052301000041 问题如下 investor purchases eight-year, 6.4% annucoupon eurobonpricepansells it after six years. Assuming interest rates rise 100 bps immeately after purchase, the investor’s rate of return the enof six years is: A.lower th6.4%. B.equto 6.4%. C.higher th6.4%. A is correct. The future value of reinvestecoupon interest is= FV(0.074,6,6.4,0,0) = 46.245.The sale priof the bonthe enof six years is= PV(0.074,2,6.40,100,0) = 98.202,whiresults in a six-yehorizon yielof 6.32%, whiis lower th6.40%:B anC are incorrect, because interest rates have risen anthe investor’s investment horizon is not long enough to offset the pricline with aitionreinvestment return. 六年后卖出的价格sell price是未来现金流折现求和未来还剩两年，N=2；YTM=7.4；PMT=6.4；最后面值FV=100，折现得到PV=98.202

NO.PZ2023052301000041问题如下 investor purchases eight-year, 6.4% annucoupon eurobonpricep(settlement: 15 June 2031; maturity: 15 cember 2039) ansells it after six years. Assuming interest rates rise 100 bps immeately after purchase, the investor’s rate of return the enof six years is: A.lower th6.4%.B.equto 6.4%.C.higher th6.4%. A is correct. The future value of reinvestecoupon interest is= FV(0.074,6,6.4,0,0) = 46.245.The sale priof the bonthe enof six years is= PV(0.074,2,6.40,100,0) = 98.202,whiresults in a six-yehorizon yielof 6.32%, whiis lower th6.40%:B anC are incorrect, because interest rates have risen anthe investor’s investment horizon is not long enough to offset the pricline with aitionreinvestment return. 什么是eurobon还有如果初始购买价格不是pvalue，计算回报率时，是不是就不应该除以100， 而是应该除以实际购买的价格？