You are assigned the task of evaluating the improvernent in productivity of small businesses. Data for one of the small businesses you are to evaluate is shown below. The data are the monthly average of last year and the monthly average this year. Determine the multi-factor productivity using the following costs: - labor: $13.50 per hour - capital: 0.75% per month of investment - energy: $.83 per BTU a. What was last year's multi-factor productivity? b. What is the muti-factor productivity for this year? c. What is the percent change