An online coffee store charges a flat rate of $2.75 plus $0.25 per pound for shipping on all orders up to (but not including) 4 pounds. For all orders of 4 pounds or more, shipping will be free.

Draw a graph of the cost function, where the number of pounds of coffee is graphed on the horizontal axis, and the total shipping cost is graphed on the vertical axis. Plot appropriate closed and open dots where the piecewise graph "jumps". Assume that at least some nonzero amount of coffee is purchased.