sum of input vue js

      methods: {
        getTotalTaxes(index) {
            let calTaxTotal =
                parseInt(this.form.ticketInvoiceItems[index].tax_SB) +
                parseInt(this.form.ticketInvoiceItems[index].tax_SRP) +
                parseInt(this.form.ticketInvoiceItems[index].tax_YQ) +
                parseInt(this.form.ticketInvoiceItems[index].tax_RG);

            this.form.ticketInvoiceItems[index].total_tax_breakup = calTaxTotal;

            return calTaxTotal;
        }
    }