2. 外语
  3. For senior class pictures, a photographer charges x dollars to make a negative, 7x/10 dollars for each of the first 20 prints, a

For senior class pictures, a photographer charges x dollars to make a negative, 7x/10 dollars for each of the first 20 prints, a

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问题 For senior class pictures, a photographer charges x dollars to make a negative, 7x/10 dollars for each of the first 20 prints, and x/10 dollars for each print in excess of 20 prints. If $80 is the total charge to make a negative and 30 prints, what is the value of x?
选项 A、3
B、4
C、5
D、6
E、7
答案C
解析
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