In order to begin advertising the single family homes, Bert asks Abigail to figure out the cost of each home, based on the company’s costs to build the entire development. After some additional adjustments, Abigail came up with the formula for the total cost (in millions of dollars) for the development, where is the average cost (in millions of dollars) of a single family home.

What is the average cost of a single family home if the total cost, C, is 400 million dollars? Express your answer in dollars.