A specialty store placed an order for the following merchandise:

$600$ pants with a billed cost of $$29\mathrm{.}00$ each

$500$ pants with a billed cost of $$35\mathrm{.}00$ each

There was an $7\%$ discount secured for the order. Shipping charges were $$1,670$ of the total order. The merchandise needed to be ticketed, and the store incurred a $$150$ workroom cost.

a$.)$ What is the total billed cost for the order?

b$.)$ What is the discount in dollars?

c$.)$ What is the cost of goods sold for this order?