The original price of a product is 3000 yuan. Now it's 20% off. After the promotion, what percentage of the price can be raised to restore the original price

3000*(1-80%)/(3000*80%)=25%
Yes, this is the primary school problem-solving, you can use fractions
1-80%=20%
3000 × 20% = 600 yuan
3000-600 = 2400 yuan
600/2400=0.25=25%

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