Update transaction categorization logic and improve discount calculat…

[henryhabib]

This pull request makes two key updates to the app.py file in the personal finance tracker application: it adjusts the logic for categorizing high income transactions and revises the discount calculation method.

Transaction categorization:

• Increased the threshold for categorizing a transaction as 'High Income' from amounts greater than 5,000 to amounts greater than 10,000 in the categorize_transaction function.

Discount calculation:

• Changed the calculate_discount function to iteratively subtract 1% of the price for each percentage point of the discount rate, instead of simply multiplying the price by the discount rate divided by 100.…ion method

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