Consider a manufacturing company produces $1000$ units of a single product daily with the following resources data:

$($a$)$ What is the labor productivity per labor$-$hour?

$($b$)$ What is the multifactor productivity for the produced units?

$($c$)$ What is the percent change in multifactor productivity if the the energy bill could be reduced by $$1000$ per day without cutting production or changing any other inputs?