Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average(arithmetic mean) of 100 units of Country R's currency and 1 percent of one's annual income. Which of the following represents the simpilified formula for computing the income tax, for a person in that country whose annual income is I? 答案是50+I/40.....
还有一题: A certian one-day seminar consisted of a morning session and an afternoon session. If each of the 128 people attending the seminar attended at least one of the two sessions, how many of the people attended the morning session only? 1. 3/4 of the people attended both the sessions. 2. 7/8 of the people attended the afternoon session. 我觉得答案是C。可是prep给的是B 。求的不是只参加morning的人们数吗。。。。