Solve the original amount, before the changes
(a) 10% increase ended up being $100
(b) 10% decrease ended up being $90
(c) 10% decrease ended up being $100
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(a) 110% = $100. therefore 100% = ($100/110)x100 = $90.909090...
(b)90%=$90. therefore 100% = ($90/90)x100=$100
(c) 90%=$100. therefore 100% = ($100/90)x100=$111.11111...
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