有一道GRE的数学题求详细讲解：
RT
The advertisd rate for roaming harges is 0.002 cents pe second.What is that in dollars per hour?
0.072
人气：349 ℃ 时间：2020-05-24 09:53:38
解答
就直接进行单位换算就好啦,1 dollar=100 cents,1 hour=3600 second
0.002 cents pe second=0.002/100*3600=0.072 dollars per hour
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