1. Cost = room rental + transportation Let units of cost be "dollars" and let "n" represent the number of people going on the field trip. .. cost = 637 +18n .. revenue = 105 +25n
2. You want to find "n" so that revenue matches cost. .. revenue = cost .. 105 +25n = 637 +18n .. 7n = 532 .. n = 76 76 people need to make the trip to break even
