Math An appliance store can purchase a certain brand of electric heater for $45.00 from a firm in City A or for $48.50 from another firm in City B. The transportation cost from City A is $3.88 per heater. From City B, the transportation cost is $2.77 per heater.

What is the difference in cost between the two firms if the appliance store buys 500 heaters? What factors other than cost should the appliance store consider when deciding from which firm to make the purchase?