For simplicity assume maximum fuel costs for each customer request. For example, if a customer goes out on Option 1, assume the customer uses the car for the maximum of 20 km. Hence fuel costs will be 8 per km x 20 km = 160. Similarly, assume maximum variable wage costs. For example, if a customer goes out on Option 1, assume the customer uses the car for the maximum of 2 hours. Hence variable wage cost will be 50 per hour x 2 hours = 100. Hence the profit calculated will be a lower bound