A person purchased 80 pencils and sold them at a loss equal to the selling price of 20 pencils. The cost of 80 pencils is how many times the selling price of 80 pencils?

• SP of 80 pencils = CP of 80 pencils -SP of 20 pencils
  sp of 100 pencils = cp of 80 pencils
  sp of 80 pencils = 80*80/100 = cp of 64 pencils
  Ratio of cp of 80 pencils to sp of 80 pencils = 80CP/80SP = 80CP/64CP = 5/4=1.25 times
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