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The XYZ Corporation sells pens, pencils, and erasers. The pens make up 2/5 of all sales, the pencils 1/10 of pens and the erasers 1/2 of pens and pencils together. What percentage of all sales is for eraser?

The XYZ Corporation sells pens, pencils, and erasers. The pens make up 2/5 of all sales, the pencils 1/10 of pens and the erasers 1/2 of pens and pencils together. What percentage of all sales is for eraser? Correct Answer 22%

Percentage of pen sales = 2/5 x 100% = 40% of all sales Percentage of pencil sales = 1/10 of 40% = 4% of all sales Percentage of eraser sales = 1/2 of (40 + 4)% = 22%  of all sales.

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