Modifier le montant d'une facture fiscale

Edit this tax invoice: Change the selling price amount '2173' to '1489' everywhere it appears. Change the total/final payable amount from 2173 to 1469. Add a new line below the price breakdown that reads: 'Original SP: ₹2178 | Special Discount Coupon Applied | Final SP: ₹1469'. Keep all seller details, customer info, address, item description, GST numbers, and all other text exactly the same. Use the same font style and size as the rest of the invoice.