If a commodity is sold after a 20% price reduction and wants to recover its original price after a period of time, the percentage that should be increased on the basis of the price is () A. 20%B. 30%C. 35%D. 25%

Suppose the price x should be increased, then the equation is: (1-20%) (1 + x) = 1, and the solution is: x = 25%

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