Laptops$-$R$-$US has received an order for $450$ specially configured personal

computers for a large construction company. The small four$-$person operation has so many orders that they can no longer perform the work themselves, and they must hire extra labor to assemble the units for this new order.

They have hired six students from Cal State University to work part time,

$20$ hours per week, to assemble the computers. The prototype unit required

$45$ hours of direct labor; from experience, the owners know that their computer assembly operation has an $86-$percent learning curve. How long will

it take Laptops$-$R$-$US to deliver the completed order? If the six students are

paid $$10$ per hour, how much should Laptops$-$R$-$US charge the customer.

$($Assume that Laptops$-$R$-$US$$s overhead rate is $145$ percent of direct labor

cost and the expected profit margin is $10$ percent.$)$