Hello everybody,
I was presented with the problem in question
it is a simple screen which only has to do some mathematical operations.
the numbers contained in the "TOT1" and "TOT2" textboxes are integers while the number contained in the "Cost" textbox is a number with a comma (0.00981) pre-inserted in the textbox because it is a constant number.
i can't solve the problem.
Please help.
Thanks a lot.
![error](https://community.appinventor.mit.edu/uploads/default/original/3X/2/f/2faa55eacb26e469ef63eb0a3027b37fd8fb9bfa.jpeg)