问一道题：NO.PZ2018113001000011

NO.PZ2018113001000011 问题如下 A manager termines ththe current level of excess cash is $15 million. He cis to purchase futures contractsto replicate the return on target sto. He wants to invest $15 million in stoaverage beta of 1.20 . appropriate stofutures contrais price$200,000 anha beta of 1.05. The number of stofutures contracts are: A.buy 86 stofutures contracts B.buy 85 stofutures contracts C.buy 87 stofutures contracts A is correct.解析需要的股票期货合约= (1.20−01.05)($15,000,000$200,000)=85.71{(\frac{1.20-0}{1.05})}{(\frac{\$15,000,000}{\$200,000})}=85.71(1.051.20−0​)($200,000$15,000,000​)=85.71因此需要买入86份股票合约。 这个题target beta应该是多少啊？会计算，但是题目不是很理解

NO.PZ2018113001000011 问题如下 A manager termines ththe current level of excess cash is $15 million. He cis to purchase futures contractsto replicate the return on target sto. He wants to invest $15 million in stoaverage beta of 1.20 . appropriate stofutures contrais price$200,000 anha beta of 1.05. The number of stofutures contracts are: A.buy 86 stofutures contracts B.buy 85 stofutures contracts C.buy 87 stofutures contracts A is correct.解析需要的股票期货合约= (1.20−01.05)($15,000,000$200,000)=85.71{(\frac{1.20-0}{1.05})}{(\frac{\$15,000,000}{\$200,000})}=85.71(1.051.20−0​)($200,000$15,000,000​)=85.71因此需要买入86份股票合约。 老师能不能总结一下什么时候四舍五入，什么时候取整