Use the table below to calculate various productivity measures for a firm that uses labor, electricity, and materials in the production process. Input or Output Units Cost Output 50,000 units Labor 1,000 hours $27,500 Electricity 100,000 MWh $15,000 Materials 7,500 units $17,500 1. Calculate labor productivity using units of labor. 2. Calculate labor productivity using labor costs. 3. Calculate electricity productivity using electricity costs. 4. Calculate materials productivity using materials costs