题目内容：

问一道英文数学题,
what is the present value of the following?
$845 perpetuity discounted back to the present at 18%

优质解答

翻译：
下面数值的现值是多少?
845美元养老金按18%的贴现率.
设现值为x
则,x（1+18%）=845
所以现值x=845/（1+18%）=716