请教一道数学题

jhiiool

补充材料 PROBLEM SOLVING A corporation with 5,000,000 shares of publicly listed stock reported total earning of $7.20 per share for the first 9 months of operaion. During the final quarter the number of publicly listed shares was increased to 10,000,000 shares,and fourth quarter earnings were reported as $1.25 per share.What are the average annual earnings per share based on the number of shares at the end of the year?

A. $1.83 B.$2.43 C.4.85 D.8.45 E.$9.70 答案：C 我用了几种方法都算不出c的数字来。

himba

(7.2*5*10^6+1.25*10^7)/10^7=4.85

注意是增加到10^7,分母是10^7