medium · LSAT Logical Reasoning

A manufacturer of high-efficiency lightbulbs reported that although their new bulbs last five times longer than traditional bulbs, total sales volume for the year actually increased after most of their regular customers switched to the new product.

Which one of the following, if true, most helps to resolve the apparent paradox described above?

  1. During that same year the manufacturer pushed into three new international markets it had never sold in before.
  2. Most buyers of the new bulbs reported being genuinely satisfied with the quality and warmth of the light cast.
  3. Traditional bulbs contain trace mercury, which makes them somewhat harder to dispose of safely than the new ones.
  4. The new high-efficiency bulbs cost the company slightly more per unit to manufacture than the traditional ones.
  5. The new bulbs were so reliable that almost no customer who switched ever came back later for a replacement bulb.

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