Problem

A basic cellphone plan costs $20 per month for 60 calling minutes. Additional time costs $...

A basic cellphone plan costs $20 per month for 60 calling minutes. Additional time costs $0.40 per minute. The formula

gives the monthly cost for this plan, C, for x calling minutes, where x > 60. How many calling minutes are possible for a monthly cost of at least $28 and at most $40?

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