Wu Company incurred $$40,000$ of fixed cost and $$50,000$ of variable cost when $4,000$ units of product were made and sold. If the company's volume increases to $5,000$ units, the company's total costs will be:

A$.$ $$100,000$

B$.$ $$90,000$

C$.$ $$102,500$

D$.$ $$80,000$