Martin Manufacturing has implemented several programs to improve its productivity. They have asked you to evaluate the firm's productivity by comparing this year's performance with last year's. The following data are available: Last Year This Year Output 10,500 units 12,100 units Labor Hours 12,000 13,200 Utilities $7,600 $8,250 Capital $83.000 $88,000 By what percentage has multifactor productivity increased? 91.67% 4.76% 6.28% 9.89% 8.07%