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: D

是用等比数列死算出来吗？