University of Florida engineering students are planning operating a mobile car clinic in Gainesville, Florida, during their summer break. This is an option to summer employment stacking plastic cups at a local injection molding manufacturer where they can earn $10,000 each over the three-month summer period. A van equipped for such service can be leased at a cost of $5,000 for the summer from an owner taking a long vacation in the Bahamas. Additional projected costs are $2,500 for insurance, and $5 per service call for materials and supplies. Their service calls would be priced at $30 per unit, plus any parts costs (parts will not be inventoried, but purchased from local parts outlets).

A. Determine the accounting cost function for this business (ignoring parts)?
B. Determine the economic cost function for this business?
C. Determine the economic break even number of units for this operation? (Assume a $30 price and ignore interest costs associated with the timing of the lease payments.)