For the Advanced Problem Solver

Once you have identified optimum values for all three of the key variables, you should be making a profit near $235,000 on a regular basis.  If not, you must work to refine your optimum values further.  Remember that when you started experimenting with the first variable, you set the other two at some moderate value.  Now that you have what you think are optimal values for all three, you should go back to that first one and try a range of values again to see if a different optimum emerges.  This is especially essential if you are not yet making Aunt Pearl's hoped for $235,000.  This is also an important step in your problem-solving process, and you should make note of what else you try at this stage when you report to Aunt Pearl.