Assume a file sales.txt in the default location. Write statements) to calculate the sum of all sales numbers in sales and add the additional line "The total sales is to the file sales.txt" You should put the total sales number in the currency format in the blank. For example. If there are two sales number in the "sales.txt. 34 56 and 1223. You should add the sentence The total sales is $16.79 in the sales txt nle, Ta