Help in calculations

Hi everyone ! I am a beginner and I have thought about a funny app.
The wanted result : user click on a button, which starts a timer.
While creating the profile the user enters how much money he gets per 1 hour
The problem : How can I create that when he stops the timer he will get a message of how much money he did on that time.

Bonus : once we found a solution to that problem I would like that he will keep gathering the amount of money they managed to save during each time - and to show them a statistic of a weekly chart or monthly

I really appreciate the help I dont know how to continue building my app without it

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