"Captain America: Civil War" still on top of table

Topping the charts this week for second week in a row is "Captain America: Civil War." Total gross so far is $314 million, up $91 million from the box office gross from last week. With a movie budget of $250 million, that is a decent profit on the investment made. ROI is 0.256 based on the formula I
pulled from google: ROI = (GAIN - COST)/COST. I am an economics novice. So I welcome any pointers in the right direction.