On a coordinate plane, a graph shows area to paint in square feet on the x-axis and primer needed in gallons on the y-axis. A step graph has horizontal units that are each 1 units long. The left end of each segment is an open circle. The right end of each segment is a closed circle. The left-most segment goes from (0, 1) to (200, 1). Each segment is 1 unit higher and 1 unit farther to the right than the previous segment. The rightmost segment goes from (800, 5) to (1,000, 5).
Interpret the graph to determine the statement the manager at a building supply store can use to help a customer determine how much primer to purchase.

Each gallon of primer will cover a (blank)of (blank) square feet.