[转帖] math 求助

JINMINGRUI

36. DS a company,whose business is to help others to prepare party with 50 to 100 participants,charge how much to such kind of party
i, charge totally 300n-n^2 to the whole party
ii,the company charge $160/person

何解？

joywzy

E。

JINMINGRUI

thanks,i feel the same way.

steven.wei

i suppose e
1) you do not know n(numbers), so u can not figure out the whole price for the party

2) u do not know the numbers.

i feel this question is a little stranges.