The surface area of a rectangular prism with length  l ,  width  w ,  and height  h  is  2 l w + 2 w h + 2 l h .  Reba painted a box shaped like a rectangular prism for her little sister to use as a treasure box. The treasure box is 12 inches long, 5 inches wide, and 4 inches high. What is the surface area of the treasure box?​