$3.$ Without changing the data for the job from requirement $2$ above, what is the selling price for job $408$ if the total number of machine$-$hours in the assembly department increases from $3000$ machine$-$hours to $6,000$ machine hours? $($Round your final answer to $2$ decimal places.$)$

$4.$ Restor ethe total number of machine$-$hours in the assembly department to $3,000$ machine hours. And keep the job data the same as it was in requirement $2.$ What is the selling price fore Job $408$ if the total number of direct labor$-$hours in the assembly department decreases from $80,000$ direct labor$-$hours to $50,000$ direct labor hours? $($ Round your final answer to $2$ decimal places.$)$