问题如下图：
选项：
A. 
B. 
C. 
解释：
老师，我有个问题， 题目中提到复息12次，我一开始看题目理解为4年复息12次，看答案才知道是一年复息12次，但题目里那句话并没有提到每年12次这样的字眼， 请问这是怎么从题目判断的一年12次而不是四年12次呀？
NO.PZ2016031001000075 问题如下 The annuyielto-maturity, statefor with a periocity of 12, for a 4-year, zero coupon bonprice75 per 100 of pvalue is closest to: A.6.25%. B.7.21%. C.7.46%. B is correct.The annuyielto-maturity, statefor a periocity of 12, is 7.21%. It is calculatefollows:PV=FV(1+r)NPV=\frac{FV}{{(1+r)}^N}PV=(1+r)NFV75=(100(1+r)4×12)75={(\frac{100}{{(1+r)}^{4\times12}})}75=((1+r)4×12100)10075=(1+r)48\frac{100}{75}=(1+r)^{48}75100=(1+r)481.33333 =(1+r)48[1.33333]1/48 = [(1+r)48]1/481.3333302083= (1 + r)1.00601 = (1 + r)1.00601−1 = r0.00601 = rr × 12 = 0.07212, or approximately 7.21%考点bonvaluation解析利用计算器PV= -75，FV=100，PMT=0，N=4×12=48，求得I/Y=0.601×12=7.21，故B正确。 计算求解过程明白了， 问两个表述是什么意思1. statefor a periocity of 12 的periocity 是什么含义， 分12期计息吗 2. 题干最后一句怎么看出是让求YTM的，75 of100是什么意思
NO.PZ2016031001000075 问题如下 The annuyielto-maturity, statefor with a periocity of 12, for a 4-year, zero coupon bonprice75 per 100 of pvalue is closest to: A.6.25%. B.7.21%. C.7.46%. B is correct.The annuyielto-maturity, statefor a periocity of 12, is 7.21%. It is calculatefollows:PV=FV(1+r)NPV=\frac{FV}{{(1+r)}^N}PV=(1+r)NFV75=(100(1+r)4×12)75={(\frac{100}{{(1+r)}^{4\times12}})}75=((1+r)4×12100)10075=(1+r)48\frac{100}{75}=(1+r)^{48}75100=(1+r)481.33333 =(1+r)48[1.33333]1/48 = [(1+r)48]1/481.3333302083= (1 + r)1.00601 = (1 + r)1.00601−1 = r0.00601 = rr × 12 = 0.07212, or approximately 7.21%考点bonvaluation解析利用计算器PV= -75，FV=100，PMT=0，N=4×12=48，求得I/Y=0.601×12=7.21，故B正确。 没看懂这道题讲啥，可以翻译一下吗
NO.PZ2016031001000075 问题如下 The annuyielto-maturity, statefor with a periocity of 12, for a 4-year, zero coupon bonprice75 per 100 of pvalue is closest to: A.6.25%. B.7.21%. C.7.46%. B is correct.The annuyielto-maturity, statefor a periocity of 12, is 7.21%. It is calculatefollows:PV=FV(1+r)NPV=\frac{FV}{{(1+r)}^N}PV=(1+r)NFV75=(100(1+r)4×12)75={(\frac{100}{{(1+r)}^{4\times12}})}75=((1+r)4×12100)10075=(1+r)48\frac{100}{75}=(1+r)^{48}75100=(1+r)481.33333 =(1+r)48[1.33333]1/48 = [(1+r)48]1/481.3333302083= (1 + r)1.00601 = (1 + r)1.00601−1 = r0.00601 = rr × 12 = 0.07212, or approximately 7.21%考点bonvaluation解析利用计算器PV= -75，FV=100，PMT=0，N=4×12=48，求得I/Y=0.601×12=7.21，故B正确。 能否这样计算？75乘以（1+r/12）的48次方等于100。
NO.PZ2016031001000075 请问零息债券为什么会一年付息12次？
老师，这道题能否一下，没有理解
