How much discount can the shopkeeper make when he guarantees to earn 20% profit for a piece of clothing with a price of 128 yuan and a purchase price of 80 yuan? Please write the equation of degree one variable

Earning 20% of the selling price is 80 × (1 + 20%) = 96 yuan
So you can give 96 △ 128 = 0.75 = 7.50% discount

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