A Cleaning Company Uses $10 of Chemicals, $40 of Labour

Multiple Choice

A cleaning company uses $10 of chemicals, $40 of labour, 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 50%. By what % has multifactor productivity fallen?

A) 0%
B) 8.3%
C) 25%
D) 50%
E) 0.83%