percentage_changed("$800", "$600") ➞ "25% decrease"

percentage_changed("$1000", "$840") ➞ "16% decrease"

percentage_changed("$100", "$950") ➞ "850% increase"

self.assertEqual(percentage_changed("$800", "$600"), "25% decrease")
self.assertEqual(percentage_changed("$1000", "$840"), "16% decrease")
self.assertEqual(percentage_changed("$100", "$950"), "850% increase")

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