Gina is comparing four long distance phone plans. The table shows the cost of each plan.Cost of Phone PlansPlanMonthly FeeCost per MinuteA$15$0.05B$5$0.15C$10$0.10D$20$0.20If Gina plans to use 500 minutes each month, the most cost effective plan is

Multiply each plan’s cost per minute by 500, then add its monthly fee. Plan A costs $15 + (500 × $0.05) = $40; Plan B costs $80, Plan C costs $60, and Plan D costs $120. Plan A is the least expensive, so the most cost-effective choice is Plan A.

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