[求助]天山-9-Q24

ninaluan

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,请教这题怎么做出来的?谢谢!!

gmat2004_ml

0.01*20/10 =0.02 =2%