Answer:
So, $4,500 is the commission on the painting.
Explanation:
Selling Price of the painting = $22,500.
Commission Percentage = 20%
Now, we know that commission is always applied on the selling price of the object.
So, 20% of $22, 500 =

So, 20% of $22,500 = $4,500
So, $4,500 is the commission on the painting sold at the gallery.