GWD7-20偶不会做~~

Yingyutao22

Q30:

A glass was filled with 10 ounces of water, and 0.01 ounce of the water evaporated each day during a 20-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%

答案给的D. 我不会做...请教啊!~~~

Yingyutao22

晕倒．．看成每天蒸发的比率是０.０１了．还想着用复利那种计算．这个破题．

sportman

0.01 ounce evaporated each day =>
0.01 * 20 = 0.2 ounces evaporated after 20 days
0.2 ounce / 10 ounces = 2%