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OpenStudy (anonymous):
HELP! George wants to get his grandmother a cell phone for emergencies. He is comparing the costs of two pre-paid plans. Plan A costs a flat $0.25 per minute for each call. Each call on Plan B costs $0.50 for the first minute and then $0.15 per each additional minute. Plan A will be less expensive for her if each of her calls do not go over how many minutes?
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