A cell phone carrier offers two plans for text messaging. Plan A costs $20 per month plus $0.05 per text. Plan B costs $10 per month plus $0.10 per text. For how many text messages per month are the plans the same cost?

Let x be the number of texts. Plan A costs $20 + $0.05x, and Plan B costs $10 + $0.10x. Set the costs equal: 20 + 0.05x = 10 + 0.10x, so 10 = 0.05x and x = 200. The plans cost the same at 200 texts per month, choice C.

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