[练习册] OG13-PS:诊断测试

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Last month a certain music club offered a discount to preferred customers. After the first compact disc purchased, preferred customers paid $3.99 for each additional compact disc purchased. If a preferred customer purchased a total of 6 compact discs and paid $15.95 for the first compact disc, then the dollar amount that the customer paid for the 6 compact discs is equivalent to which of the following?
  • 5(4.00) + 15.90
  • 5(4.00) + 15.95
  • 5(4.00) + 16.00
  • 5(4.00-0.01) + 15.90
  • 5(4.00-0.05) +15.95
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