CSC v1 补充题 chapter 8 and 9,求第16、17题解题步骤
16、An investor purchased 500 shares of ABC Security at $1.9 per share in early morning trading, promising to deposit sufficient margin before business the following morning. If the shares ranged in price from $1.6 to $2.05 during the day before closing at $1.7, what is the margin he would be required to deposit, assuming that he started the day with no cash or securities in his account?
和接下来一题17
查看原版教材第9章第4页，有一个maximum equity loan value 的表格，对应16题的价格为1.9的share，你的original cost 为500*1.9=950，价格跌到了1.7是，对应表格的maximum equity loan 是20%，也就是当价格跌到了1.7，你做多能借的钱为20%*1.7*500=170， 那么margin为950-170=780（你自己要付的钱）
17. 接上一道题， 原本margin为780，对应表格现价为2.2时maximum loan 为50%， 所需margin为50%， maximum loan value 为2.2*500*0.5=550，所需margin为950-550=400， 之前已有margin780， 有margin surplus 380
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