A product is sold in three sizes: 500 g for R40, 750 g for R54 and 1000 g for R76. Which size is the cheapest per gram?

Answer and explanation

Correct answer: D. 750 g for R54

  1. Step 1: Divide each price by its mass: R40/500 g = R0,0800 per g; R54/750 g = R0,0720 per g; R76/1000 g = R0,0760 per g.
  2. Step 2: The smallest value is for the 750 g size.
Answer
750 g for R54.
Why not the others: 500 g for R40: this size is not the cheapest per gram. 1000 g for R76: this size is not the cheapest per gram. All three cost the same per gram: the prices per gram are different.

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