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Tao Nan SA 1 paper 2 Question 18

At shop A, Mr Tang bought a laptop for $2400 which has 20% more than the price that Shop B sold it for. (A) How much did Shop B sell the laptop at? (B) During a sale, both shops offered an equal discount on the same laptop. Mr Tang bought a second laptop at Shop B and paid $320 less than the discounted price in Shop A. What was the percentage discount?

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