For the correct writing of invoices with the correct calculation of igvWith the VAT calculator you can:Enter, base amount, IGV or the total amount.It will show INSTANTLY as a result:- BASE AMOUNT, in numbers with two decimal places.- IGV, in numbers with two decimal places- TOTAL AMOUNT, in numbers with two decimal places.Enter, Pay with, to Cobra.It will show INSTANTLY as a result:-Pay with, in numbers with two decimal places.-A Charge, in numbers with two decimal places.This application can be used offline.