After two price adjustments, a kind of clothes in the clothing supermarket returns to the price before the price adjustment. The first price reduction is 20%, and the second price increase is 20%______ %．

Let the original price be 1,1 × (1-20%), = 1 × 80%, = 0.8; (1-0.8) △ 0.8, = 0.2 △ 0.8, = 25%; answer: the second price increase is 25%. So the answer is: 25

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