Contact Form 7 Calculator Plugin issue

I am wandering if there is a cheat sheet with how the code should be written for the calculations. I saw one youtube video and it was not very good and did not have any words in it. I am trying to find out what is acceptable, even as far as can it have something highlight after you make a choice for a 2nd choice? What are the easy set up for calculations like if I have a table and I put a number in one column and a drop down in another column how do I do a total for the third column? There should be some kind of sheet people could look at for different options with this plugin.