At Dominos pizza the time study restaurant yielded an average observed time of $4\mathrm{.}0$ minutes. The analyst rates the observed worker at $85\%.$this means the worker performed at $85\%$ of normal when the study was made. The firm uses a $13\%$ allowance factor. What is the standard time for this operation.

$3\mathrm{.}8$min

$9\mathrm{.}3$min

$3\mathrm{.}4$min

$3\mathrm{.}9$min