Find the ratio of the increased price

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I don't know why I can't figure this out. It's so simple, but I just can't get it.. It's the simplifying that I can't get right. The correct answer (1/5) just doesn't make sense to me.

Here's another one.

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Cobalt_Blaze

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Posted: 9 years ago
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External URL: reddit.com/r/MathHelp/co...