Sale model SU6191 = unit price of SU6191 * number of unit model SU6191 sold Sale model SU6192 = unit price of SU6192 * number of unit model SU6192 sold Sale model SU6193 = unit price of SU6193 * number of unit model SU6193 sold Subtotal = Sale model SU6191 + Sale model SU6192 + Sale model SU6193 Tax = subtotal * 8.25% Total = subtotal + Tax Balance = amount paid - total The method to prepare the receipt is in the following format: . . . . . .. . . . . . . . . . ..... . RECEIPT - SALE SU0619 PRODUCT Date : 06/15/19 Sale transaction: 150001 . . . . . . .. . . . . Model SU6191 (10.99/per unit) 10 109.90 Model SU6192 (12.99/per unit) 10 129.90 Model SU6193 (14.99/per unit) 10 149.90 Sub total: 389.70 Tax (8.25%) 32.15 Total : 421.85 Amound paid: 500.00 Balance: 78.15 In file for a day sale, for example, file name of day sale on 06/15/2019 is daySale_190615.txt The first column is transaction, second column is number of SU6191 units sold, the third column is the number of SU6192 units sold and the last column is the number of SU6193 units sold. The method to prepare one line to write to the output file has the following format