Hello @Vasishta_Monavarty!
A simple way to do accomplish what you are looking to do could be to create two columns tracking the dollar amount associated with a record (so you’d have reference of what the initial dollar amount was).
Then you could create a third column with a formula to calculate the difference between the current and initial prices:
A more versatile way you could accomplish this would be to utilize Airtable Automations using the update record action. You could set up an automation so that whenever an existing record is updated it will update the both the fields indicating that the record has changed and by how much.
I hope that helps-- but please let me know if you have any further questions!