Science Bowl Question

📅 NSB Middle School 2021🎓 MS🔄 Round 3#️⃣ Question 13🌟 BONUS✍️ Short Answer

A cell phone plan costs a fixed rate per month plus a charge per text message. One month, Sally had 300 texts and her total bill was $58. The next month, she had 700 texts and her total bill was $90. In dollars, what is the fixed rate per month?

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