Question 663974
Let c = cost per coat


"Two Coats and four dresses cost $420" and "each dress cost $50" means that


2c + 4*50 = 420


2c + 200 = 420


2c = 420 - 200


2c = 220


c = 220/2


c = 110


So each coat costs <font color="red">$110</font>