Abe is a custom picture framer. His total fixed cost is $$20$ a day, and his average variable Few people know about Abe's Framery and he is maximizing his profit by selling $10$ picture frames a day for $$4$ a frame. Abe thinks that if he spends $$10$ a day on advertising, he can increase his market and sell $40$ picture frames a day for $$4$ a frame. If Abe advertises will his average total cost increase or decrease at the quantity produced?

If Abe advertises and as a result he sells $40$ picture frames a day for $$4$ a frame, his

A$.$ average total cost decreases at the quantity produced

B$.$ average total cost does not change at the quantity produced

C$.$ average total cost increases at the quantity produced

D$.$ average total cost decreases if total cost decreases, and increases if total cost increases