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A cleaning company uses $10 of chemicals, $40 of labor, and $5 of misc. expenses for each house it cleans. After some quality complaints, the company has decided to increase its use of chemicals by 60%. By what percentage has multifactor productivity changed? increases 9.8% decreases 6.7% increases 8.3% decreases 9.8% decreases 8.3% Which of the following nets the largest productivity improvement? decrease input 20%, increase output 3% increase both output and input by 5% increase output 30%, decrease input 1% decrease input 20% increase output 15%