Question $1(100$ Points$)$:

A crew of four carpenters and two laborers will be used to build the formwork for a concrete structure. Work is scheduled for $9$ hr per day on Monday through Friday and $8$ hr on Saturday. Overtime at a rate of one and one$-$half will be paid for all hours over $8$ hr per day during the week and double time for all Saturday work. The base wage, taxes, and insurance rates are given in table below.

a$)$ Calculate the hourly cost for the crew;

b$)$ Calculate the overhead percentage in employing the crew against the basis of "bare cost".

$\backslash$table$[[$Item$,$Carpenter,Laborer$],[$Base wage,$$\frac{21\mathrm{.}78}{h}r,$$$\frac{15\mathrm{.}56}{h}r$