Answer
Plan B is less expensive at over 200 miles.
Work Step by Step
1. Set up your formula for how much each plan costs per day.
Plan A: 30+0.10m
Plan B: 50
2. Create an inequality.
50$\lt$30+0.10m
3. Simplify.
50$\lt$30+0.10m
20$\lt$0.10m
200$\lt$m or m$\gt$200
This means that Plan A saves money at less than 200 miles, the plans are equal at exactly 200 miles, and Plan B saves money at over 200 miles.
