GWD,第3套，请教

wenjie87

Q24:
A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a twenty-day period.  What percent of the original amount of water evaporated during this period?

A.    0.002%
B.    0.02%
C.    0.2%
D.    2%
E.    20%
Answer:C
我做出来是选D，百思不得其解，请牛牛帮助