chanson · 2020年11月16日
问题如下：
Annabelle opened a margin account to buy 450 shares of a public common stock for $31,500, but she didn't have enough money. So she posted initial margin of 30%. The maintenance margin requires 25%. When would Annabelle get a margin call if the stock declined steadily?
选项：
A. $58.00.
B. $65.00.
C. $72.50.
解释：
B is correct.
（1-0.3）/ (1-0.25) *(31500/450)= $65.33
请告知答案公式所表达的详细含义NO.PZ2015122801000056问题如下 Annabelle openea margin account to buy 450 shares of a public common stofor $31,500, but she 't have enough money. So she posteinitimargin of 30%. The maintenanmargin requires 25%. When woulAnnabelle get a margin call if the stoclinestealy?A.$58.00.B.$65.00.C.$72.50. B is correct.（1-0.3）/ (1-0.25) *(31500/450)= $65.33B是正确的。本题考察的是收到保证金电话对应的公式。根据上课老师的公式maintenanmargin = 【P1 * initimargin + （P2 – P1）】/P2可得0.25 = [31500/450 * 0.3 + (P2 – 31500/450)]/P2P2 = 65.33 利用债务不变原理求解P0*（1-M intital）=PL*(1-MM)PL=Po(1-M intital)/(1-MM)=31500/450(1-30%)/(1-25%)=57.64我不知道我错在哪里也？
为什么这道题用P0*IM+(PL-P0)的和除以P0算出来是 68 不是65.33 和书上公式算出来不一样 可是明明前面那个公式可以推导到后面的公式
按照老师讲的公式做对了，但是不记得maintenance的详细定义了？可否再提示一遍？
