NO.PZ2018062003000066
问题如下：
Being a monopoly in the market, Googge,Inc. recently carrys out its market study and finds that the price elasticity of demand is 1.8. If the marginal cost is $30 and the average cost is $50, its price is most likely to be:
选项：
A.$30.
B.$50.
C.$68.
解释：
C is correct
When MR = MC, the firm can achieve maximized profits. Because MR =P(1-1/|E|) we can draw the equation:
$30 = P[1 – (1/1.8)] = P × 0.444
P = $68
考题：利润最大化
解析：本题直接考察利润最大化，
直接套用公式，MR =P(1-1/|E|)，代入数据得：
$30 = P[1 – (1/1.8)] = P × 0.444，反解得到P
P = $68
不是说P=ATC吗，为啥不是50
