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S.1 Maths Question*s

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1. David saves 12 dollers by buying a basketball at a 15% discount.What is the marked price of the basketball? 2.Peter buys a dozen of pens at 45% off and saves 27 dollers. (a)Find the marked price of a dozen of pens. (b0Find the selling price of each pen.

最佳解答:

1. Let y be the marked price of the basketball, 15%y=$12 y=$80 ∴The marked price of the basketball is $80. 2a. Let a be the marked price of a dozen of pens, 45%a=$27 a=$60 ∴The marked price of a dozen of pens is$60. b. The selling price of each pen =($60/12)(1-45%) =$2.75

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