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A cell phone plan charges a $40 base fee. If the total cost of talking 20 minutes is $41, what is the rate of change of the cost per minute talked?
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A cell phone plan charges a $40 base fee. If the total cost of talking 20 minutes is $41, what is the rate of change of the cost per minute talked?

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40+20m=41 subtract 40 from both sides

20m=1 divide both sides by 20

m=1/20

m=5/100

m=$0.05 per minute (5 cents per minute)
User Svlasov
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