TT GWD18-14，麻烦指教

The graph above shows the combined revenue, in billions of dollars, of a chain of food stores for each year over a four-year period.  In 1994 a certain store’s revenue accounted for 2.0 percent of the combined revenue for that year, and in 1995 the same store accounted for 2.3 percent of the combined revenue for that year.  What was the approximate percent increase in revenue for this store from 1994 to 1995 ?

A.     0.3%

B.     15.0%

C.     25.0%

D.     30.4%

E.      43.8%

图不会贴，我描述一下吧：the combined revenue for 1994 is 8 billion dollars, the combined revenue for 1995 is 10 billion dollars.

答案是E，我觉得是D，为什么呢？我的算法是(10*2.3/100-8*2/100)/(8*2/100),麻烦指导指导。。非常感谢！

OH！谢谢！原来我犯了那么弱智的计算错误！

我当时是把2.3/100当做2/100作估算，然后算得答案应该是比25%大的，所以就选D了，想不到答案是比25%大那么多！