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Having trouble with this problem third attempt and not knowing why On April 3, 1988 the cost to mail a letter in the US' was

Having trouble with this problem third attempt and not knowing why

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On April 3, 1988 the cost to mail a letter in the US' was raised from 22 cents to 25 cents. Find the relative change in the cost. Relative change = www. wikipedia.com, accessed January 8, 2017

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