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Bob has saved $30 per week to buy a new Blu-ray player. He compares two different models: a Panaview that is priced at $130 and a Zony model that is priced at $140. Bob decides to purchase the Zony Blu-ray player for $140. Identify what role money plays in each of the following parts of the story.

a. Sean can easily determine that the Panaview model has a lower price than the Zony model.
b. Sean saved $30 per week.
c. Sean pays $140 for the Blu-ray player.