NO.PZ2018062019000014
问题如下：
A three-year investment requires an initial outlay of £1,000. It is expected to provide three year-end cash flows of £200 plus a net salvage value of £700 at the end of three years. Its internal rate of return (IRR) is closest to:
选项：
A.10%
B.11%
C.20%
解释：
B is correct.
IRR is determined by setting the net present value equal to zero for the cash flows shown in the table.
我对答案讲解的没问题，但问题怎么求IRR？
NPV=0=-1000+200/(1+IRR)+200/(1+IRR)^2+900/(1+IRR)^3 ? 手算吗？太难了吧？可以用计算器吗？问题怎么用计算器计算呢？谢谢，在计算器哪里可以输入NPV=0呢？
