2. 外语
  3. If the cost of a long-distance phone call is c cents for the first minute and 2/3 c cents for each additional minute, what is th

If the cost of a long-distance phone call is c cents for the first minute and 2/3 c cents for each additional minute, what is th

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问题 If the cost of a long-distance phone call is c cents for the first minute and 2/3 c cents for each additional minute, what is the cost, in cents, of a 10-minute call of this type?
选项 A、5/3 c
B、6c
C、20/3 c
D、7c
E、23/3 c
答案D
解析 若长途电话费为第一分钟收c美分，以后每增加一分钟，加收2/3 c美分，那么按这种计费方式打10分钟的电话需付多少钱(以美分为单位)?
解：本题的正确答案为(D)。由题意可得：c+(10-1)×2/3 c=7c
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