A car rental company offers two plans for renting a car Plan
     A car rental company offers two plans for renting a car.  Plan A: $40 per day and 10c per mile  Plan B: $65 per day with free unlimited mileage  For what range of miles will Plan B save you money? (Assume the car   
  
  Solution
Let x miles be travelled then
Plan A : 40 +0.1x
Plan B : 65
Now Plan B would be more economic when: 65 < 40 +0.1x
25< 0.1x
x> 250miles
Range : ( 250 , infinity)

