Dazzling Designs made custom drapery for a client using $90$ yards of material.

$($a$)$

At $$5$ per yard, what is the cost $($in $$)$ of the material?

$

$($b$)$

If the company received $4$ more orders of the same size, how much more material $($in yd$)$ will be needed to fill the orders?

yd