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  3. a basic cellular package costs 40 month for 60 min

A basic cellular package costs 40 month for 60 minutes of calling with an additional...

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A basic cellular package costs 40 month for 60 minutes of calling with an additional charge of 0 20 minute beyond that time The cost function C z for using z minutes would be If you used 60 minutes or less i e if if a 60 then C z 40 the base charge If you used more than 60 minutes i e z 60 minutes more than the plan came with you would pay an additional 0 20 for each of those z 60 minutes Your total bill would be C z 40 0 20 z 60 If you want to keep your bill at 50 or lower for the month what is the maximum number of calling minutes you can use

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