Let the fraction be x/y
When numerator is decreased by 20%, numerator changes to (100%-20%) x = 80% * x = 80x/100 = 0.8 x
When denominator is decreased by 60%, denominator changes to (100%-60%) y = 40% * y = 40y/100 = 0.4 y
So the new fraction will be 0.8 x/0.4 y = 2 (x/y)
Percentage of increase = [2 (x/y) - (x/y)] * 100 / (x/y)
= (x/y) * 100 / (x/y)
= 100 %
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