받은 답변은 이러하였습니다.
Aldo Granados

Thank you for answering my question.

I understand your explanation that smallllllll fraction can cause less accurate answer, and it is inevitable limitation of device.

Nevertheless, I think it should be inaccurate 50, not inaccurate 0.

I calculated similar problem with ∑ function.

cf is {0,1,2,3,4,5,6,7,8,9,10}

Though the fraction is smaller and smaller, ∑ function does not make 55 to zero.

I expect to see inaccurate 55 in npv() function someday.

요약하면 구조적?으로 비슷한 상황을 ∑ 로 만들어 계산해 보면
0이 나오진 않는데... NPV가 좀 이상하다. 고쳐지길 기대한다.