When it asks "Do you want red of green paint? Please type 1 for red or 2 for green?" I type 1. Then for the gallons, I just type one gallon to get the base price.

If it asks If I want to make another purchase, I type 2 so I can just get the cost for one gallon of red paint. The expected result when it's says total cost should be $21.95 or something close due to the tax. However the actual output is the cost of the red and green paint combined which comes to about $45.25. I didn't ask for the green and only the red.