F公司现金部经理决定采用随机模型进行现金余额管理，确定L值应为18000元，估计公司现金流量标准差δ为2000元，持有现金的年机会成本为10.8%，转换成本b为210元，一年按360天计算。则该公司最优回归线R应为（）元。
A.12805.79
B.30805.79
C.1449137.68
D.1467137.68
参考答案：B
解析：
持有现金的日机会成本i=10.8%/360=0.0003
最优回归线R=[3×210×20002/（4×0.0003)]1/3+18000=30805.79（元）。
In this modern world, we rush around all day with no time for stillness. And when we are 48 to be still, we're in line for something, or waiting at a doctor's appointment, or on a bus or train. This comes at a 49 : we lose that time for consideration, for observing and listening. We lose peace. And 50 yet: sometimes no action is better than too much action at all. You can run around crazily, but get nothing done. Take a moment to think about how you spend your days? Are you always 51 through your schedule? Is this how you want to spend your life? If not, take a moment to be still. Don't think about what you have to do, or what you've done already. 52 be in the moment. Then after a minute or two of doing that, consider your 53 , and how you'd like it to be. See your life with less movement and less rushing. See it with more stillness and more peace. It's pretty simple: all you have to do is sit still for a little bit each day. Once you've got 54 to that, try doing less each day. Find happiness now, in this moment, instead of waiting for it. Value the stillness. It's a treasure and it's 55 to us, always.
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