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 $50\%.$ By what percentage has multi$-$factor productivity fallen?

$0\%$

$9\mathrm{.}1\%$

$8\mathrm{.}3\%$

$50\%$

$25\%$