A company is working for $6$ hours per day and produce $540$ Units. It employs $5$ workers and pays each of them $$10$ per hour, the machine cost is $$10$ per hour, material cost is $$1$ per unit and energy cost is $$20$ per hour. The multifactor productivity in units$/$per dollar$($$$)$ would be

$0\mathrm{.}5294$ unit per dollar

$0\mathrm{.}3921$ unit per dollar

$0\mathrm{.}6542$ unit per dollar

$0\mathrm{.}2987$ unit per dollar