Last summer, to earn money for their college tuition, George and Tom operated a food kiosk at Clearwater Beach, Florida for 3 months. They sold soft drinks, chips, crackers, and candy bars. A month before they were planning to open, Larry found a location that rented for $500 a month and a small refrigerator unit which they rented for $60 per month. Alan found distributors for the food products as well as for the paper products that they would need. Alan also purchased a business license for $80 and bought 3-month's worth of liability insurance for $100. The cups, straws, napkins, and extra sales people needed to staff the stand are all examples of:Marginal costs.Break even points.Variable costs.Fixed costsAverage costs.