Problem: Suppose Craig considers Oranges and Grapefruits to be perfect substitutes. Craig is willing to trade two Oranges for one Grapefruit. Craig has $8 to spend on Oranges and Grapefruits, and the price of Oranges is PO = $.40, and the price of Grapefruits is PG = $1.00. On a graph, draw Craig's Budget Constraint, identify Craig's optimal bundle, and draw the Indifference Curve that goes through that bundle. Please put the quantity of Oranges (O) on the vertical axis, and the quantity of Grapefruits (G) on the horizontal axis. Make sure your graph is accurate and properly labeled.