I am creating an app to log things. For example, I want to say that I bought 100 widgets on the 12th of January 2021 for $100 and on the 15th of January I sold 50 of them for $70.
I can see how to add things, but how do I subtract it and show that action in a log format?
So Page 1/Tab 1 of the app would be:
Buy/Sell Stock Date Price
Buy 100 widgets 12/1/2021 $100
Sell 50 widgets 15/1/2021 $70
And then on the second page/tab it would show how much I made in a graph.