Question 1 Productivity The financial data of a manufacturing firm for the past two years are as follow. Output Input Sales Labor Raw Materials Energy Capital Other 2019 $140,000 $20,000 $21,000 $4,000 $45,000 $2,000 2020 $180,000 $25,000 $39,000 $6,000 $45,000 $2,000 (a) Calculate the single-factor productivity of Energy for 2019 and 2020 separately. (b) Calculate the multi-factor productivity of Labor, Raw Materials and Capital for 2019 and 2020 separately. (c) Calculate the total-factor productivity for 2019 and 2020 separately