Q. In city of New York, plumbers have option of joining a union or working as a non-union plumber. Suppose total short-run supply of plumbers is perfectly inelastic at 500 workers per day. Union workers can often guarantee their work in ways non-union plumbers cannot, so demand for union workers is slightly higher. Let demand for non-union plumbers be WNU = 30 - 0.04L and demand for unionized plumbers be given by WU = 30 - .1L. Wages are specified as dollars per hour of work and L represents number of workers per day. Determine total demand for plumbers in New York.