A cleaning company cleans $20$ houses per day and uses $8$ bottles of chemicals at $$28$ per bottle, $30$ hours of labor at $$24$ per hour, and $$65$ of misc. expenses. What is the multifactor productivity of the company?

$0\mathrm{.}014$ dollars$/$worker

$0\mathrm{.}194$ houses$/$dollar

$0\mathrm{.}129$ houses$/$dollar

$20$ houses$/$hour

$0\mathrm{.}020$ houses$/$dollar