A pair of shoes is on sale for 30% off. The original price is p. Which expression can be used to find the price of the shoes after the discount?

A 30% discount means the buyer pays the remaining 70% of the original price: 100% − 30% = 70%. Converting 70% to a decimal gives 0.70, so the sale price is 0.70p. Therefore, the correct choice is 0.70p.

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