这道题为什么不能用opportunity2 -1 呢？

问题如下：

If you seek an 8 percent annual return on investment and have $500,000 to invest, which of the investment choices presented in Table A should you favor?

Table A: Investment Options

| Investment | Initial Investment ($) | Year 1 Cash Flow ($) | Year 2 Cash Flow ($) | Year 3 Cash Flow ($) |

|--------------|------------------------|----------------------|----------------------|----------------------|

| Option 1 | -500,000 | 200,000 | 200,000 | 200,000 |

| Option 2 | -500,000 | 230,000 | 200,000 | 160,000 |

选项：

A.

Option 1

B.

Option 2

C.

It doesn't matter; both options are equally attractive.

解释：

For Option 1: $��{�}_{������1}=\frac{200,000}{(1+0.08{)}^1}+\frac{200,000}{(1+0.08{)}^2}+\frac{200,000}{(1+0.08{)}^3}-500,000=473,014$NPV=200000/1.08+200000/1.08² +200000/1.08³ -500000
​=15,419.4

For Option 2: $��{�}_{������2}=\frac{230,000}{(1+0.08{)}^1}+\frac{200,000}{(1+0.08{)}^2}+\frac{160,000}{(1+0.08{)}^3}-500,000=475,275$NPV=230000/1.08+200000/1.08² +160000/1.08³ -500000=11,443.9