A company that makes shopping carts for supermarkets and other stores recently purchased some new equipment that reduces the labour content of the jobs needed to pro- duce the shopping carts. Prior to buying the new equip- ment, the company used four workers, who produced an average of 80 carts per hour. Labour cost was $10 per hour and machine cost was $40 per hour. With the new equipment, it was possible to transfer one of the workers to another department. Machine cost increased by $10 per hour while output increased by four carts per hour. a. Calculate labour productivity before and after the new equipment. Use carts per worker per hour as the meas- ure of labour productivity. b. Calculate the multi-factor productivity before and after the new equipment. Use carts per dollar cost (labour plus machine) as the measure. c. Comment on the changes in productivity according to the two measures. Which one do you believe is more pertinent for this situation?