[問題]考古題 Form19 sec8 DS-Q16

[凱薩琳]

What percent of the cost of a certain surgical procedure was covered by employee R's insurance plane?

(1)If 80 percent of the cost had been covered by the insurance plan,R would have had to pay $250.
(2)The cost of the surgical procedure was $1,250, and the insurance plan covered all but $312.50 of this cost.

Ans:B
看了精華區，還是不瞭解為啥（1）不行勒？

[Ace]

條件一
只能得知所有醫療費用為1250
並不知道確切保險給付額度(原題用if)