Posted by joe on Thursday, March 24, 2011 at 10:32am.
If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a cost decrease of four times?

algebra  PsyDAG, Thursday, March 24, 2011 at 11:33am
This has me confused. If you decreased the cost of something 100%, wouldn't that mean that the cell phone would be free? With 400% decrease, does the company pay you three times the original cost to take the phone?
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