On the Cartesian plane, the demand for a product is traced (with the blue color) and relates the unit price (p) in dollars according to the quantity (q) in units. The graph of the offer (with the color green) contains the point (0;80) and after applying a tax of 25 dollars it was drawn in the same plane, the offer (dotted line).

A) Calculate the equilibrium price after the tax.

B) If the state, instead of levying a tax, had subsidized the product at $55, how much does the balance amount change?