请老师解答下图12题，谢谢

老师，请问如何用计算器算出最终结果，后面几步老师在此处省略了，请老师教学一下，谢谢

我想请问一下如何准确去区分先付和后付。我做了reading6 的课后第八题，关于他的学费，我认为应该采用先付的方法去计算求出PV，再带入过去17次，去求PMT。但是答案选用的是后付去计算学费一共需要多少。所以我有点不理解。

老师，可以尽快回复一下我提问的课后题么。还是这个不在答疑范围内

如何理解贝努力随机变量，期望为p,方差为p*(1-p)

t时刻. Ame call 应该是St-X 而Euro call应该是ST-X的折现 老师判断大小时没有考虑到S t和ST的大小关系

第一道例题，最后加权算股份数，1200债券为什么要乘以100？

21题为什么选A？麻烦解释一下B和C为什么不对

23. Jaderong Plinkett Stores reported net income of $25 million. The company has no outstanding debt. Using the following information from the comparative balance sheets (in millions), what should the company report in the financing section of the statement of cash flows in 2010? Balance Sheet Item 12/31/2009 12/31/2010 Change Common stock $100 $102 $2 Additional paid-in capital common stock $100 $140 $40 Retained earnings $100 $115 $15 Total stockholders’ equity $300 $357 $57 A. Issuance of common stock of $42 million; dividends paid of $10 million. B. Issuance of common stock of $38 million; dividends paid of $10 million. C. Issuance of common stock of $42 million; dividends paid of $40 million. 这个题目选A，想请教下老师为什么增发了42m 的common stock在表里面 Common stock 行只显示变动2？

老师 我数学太差了 麻烦你教我计算一下 多谢了