Submit drawing of new profit line where lemonade profit changes from the original $0.80 to $0.50. This drawing can be in any format, a picture of hand drawing, Excel, etc. Key items to include are the old profit line, the new profit line, and the feasible region. Most of these can be pulled from the PPT, Excel, or recreated in other online tools, but can also be done using paper and pencil using some math skills, If you can calculate the old and new profit line slopes, it can be fairly easy to draw by hand as the corner points and max profit point do not change.

Problem solution in yellow cells, to reset problem set "Solution (X,Y) " cells both to 0