Consider a small sized contractor that is about to decide whether or not a new contract for nine units is economically feasible. Each unit sold will bring in a revenue of $ 1350. Each unit requires raw materials costing $ 900. There is a fixed initial investment of $ 2,100. The design indicates that the first unit will require 23 worker-hours of labor to produce. The labor cost is $ 10 per worker-hour. Determine the break-even quantity for this product