What is the increase in sales over the three-year period

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Question: The "communication revolution" has given us prepaid phone calling cards. These cards are used to make longdistance phone calls from any phone. In a recent year the industry posted sales of $500,000. Three years later the sales figure had risen to $200,000,000. What is the increase in sales over the three-year period?

Reference no: EM131620659

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