问题 问答题

2009年8月15日,甲公司股票价格为每股50元,以甲公司股票为标的代号为甲49的看涨期权的收盘价格为每股5元,甲49表示此项看涨期权的行权价格为每股49元。截至2009年8月15日,看涨期权还有199天到期。甲公司股票收益的波动率预计为每年30%,资本市场的无风险利率为年利率7%。
要求:
(1)使用布莱克一斯科尔斯模型计算该项期权的价值(d1和d2的计算结果取两位小数,其他结果取四位小数,一年按365天计算)。
(2)如果你是一位投资经理并相信布莱克一斯科尔斯模型计算出的期权价值的可靠性,简要说明如何作出投资决策。

答案

参考答案:

(1)执行价格的现值=

N(0.37)=0.6443;N(0.15)=0.5596

期权价格C=50×0.6443-47.2254×0.5596=5.7877(元)

(2)由于看涨期权的价格为5元,价值为5.7877元,即价格低于价值,所以投资经理应该投资该期权。

完形填空
The story happened years ago,when my daughter was still little.
I was driving across the country with my daughter to  1 my husband. Since I intended to get to my destination before supper time, I drove   2  for a long time without a stop. Then after driving for many miles, I became tired and needed to stop for a break to get   3 .
I found a rest area. It was mostly deserted, in a quiet area of the highway. I parked the car and carried my  4  into the restroom. When I came out I saw a middle-aged    wandering around. Feeling  6  about that, I asked the lady. What   7  me was: they were waiting for us!
The lady told me that she and her husband wanted to see us safely back into our     8  . She explained that sometimes rest areas could be a  9  place for a young lady like me. She told me that she had a daughter almost my age, so they wanted to make sure that I got safely back on my way.
I was very touched by their  10 . Being young, and probably naive to the potential  11  of rest areas, it had never occurred to me that there was any possibility of something going wrong. I  12  them for their kindness. My daughter and I continued our journey and   13  our destination safely.
I never got their names but years have passed and their kindness is still not   14  . Sometimes angels come in make-up and just because you can’t see their   15          it doesn’t mean they aren’t angels.
小题1:
A.desertB.stopC.joinD.save
小题2:
A.slowlyB.quicklyC.safelyD.quietly
小题3:
A.excitedB.boredC.interestedD.refreshed
小题4:
A.daughterB.luggageC.licenseD.car
小题5:
A.ladyB.manC.coupleD.angel
小题6:
A.angryB.curiousC.jealousD.terrible
小题7:
A.surprisedB.worriedC.annoyedD.upset
小题8:
A.roomB.carC.areaD.park
小题9:
A.quietB.noisyC.dangerousD.safe
小题10:
A.devotionB.honestyC.potentialD.consideration
小题11:
A.stopsB.dangersC.mistakesD.changes
小题12:
A.forgaveB.askedC.thankedD.blamed
小题13:
A.reachedB.leftC.missedD.passed
小题14:
A.seenB.forgottenC.desertedD.recognized
小题15:
A.kindnessB.safetyC.facesD.wings
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