Fix handleCalculateTotal function to correctly calculate totals for multiple items. issue #20

[DivyarajChudasama]

Description

This pull request addresses an issue in the handleCalculateTotal function of the InvoiceForm.js file, where the total was not correctly calculated for multiple items. The changes ensure that the subtotal, tax amount, discount amount, and total are computed accurately when there are two or more items in the invoice.

Changes Made

• Fixed the calculation of subTotal in the handleCalculateTotal function to correctly sum up the prices of all items.
• Updated the calculation logic to ensure taxAmmount, discountAmmount, and total are computed correctly based on the updated subTotal.

Testing

• Tested with multiple items to ensure the subtotal, tax, discount, and total amounts are calculated correctly.
• Verified that the calculations update dynamically when items are added, removed, or edited.

Additional Notes

• This fix ensures the integrity of the invoice calculations, improving the accuracy and reliability of the application.
• No other parts of the code were affected by these changes.

Please review the changes and let me know if there are any questions or further adjustments needed. Thank you!

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