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By what percentage did the real cost go down

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Question: Calling London. A 10-minute telephone call to London via AT&T cost $12 in 1976 and $14 in December 2007 using an occasional calling plan. Compare the real costs of these calls. By what percentage did the real cost go down between 1976 and December 2007? The CPI in December 2007 was 210.0.

Reference no: EM131638647

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