[題组一25%](第1题一第4題,每題4分第5題一第7题,每題3分)本大题請用2B作答於答案卡。
In econ nomics, utility is a measu ure of pleasure or satisfaction that consumers receive from using, owning or doing something. It is whatallows rescarchers to model how consumers choose between options. Following examples describe Alice's utility for owning sonewealth and consuming some goods. Questions 1-7 are mutiple-choice questions. Choose the best possible answer out of the choicesfrom the list.
 Questions 1-4(16%)
 Alice's utility function of wealth is shown as follows:

Similarly, when Alice has $75, S50, and $30, her utility levels are "Q', "R",and "S", respectively.

【題組】

1.Suppose Alice's utility function is U =

, where U is the utility level from owning wealth W. Alice decides to invest in abusiness which can yield $6,400 with probability 1/5, and $3600 with probability 4/5. What is Alice's expected utility of thisinvestment?
(A) 80
(B) 76
(C) 64
(D) 60
(E) None of the above.