A certain candy manufacturer reduced the weight of Candy Bar M by 20 percent but left the price unchanged. What was the resulting percent increase in the price per ounce of Candy Bar M ?
5%
10%
15%
20%
25%
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设改变前weight1=100, 则改变后weight2=80, price恒定为100 (100/80-100/100)/(100/100)*100%=25%
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设改变前weight1=100, 则改变后weight2=80, price恒定为100
(100/80-100/100)/(100/100)*100%=25%