private void cbActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cbActionPerformed
        
        if(cb.getSelectedItem().equals("São Paulo - Capital")) {
            frete = 30;
        } else if(cb.getSelectedItem().equals("São Paulo – Interior")) {
            frete = 35.5;
        } else if(cb.getSelectedItem().equals("Curitiba")) {
            frete = 45;
        } else if(cb.getSelectedItem().equals("Minas Gerais")) {
            frete = 47;
        } else if(cb.getSelectedItem().equals("Rio de Janeiro")) {
            frete = 50;
        } else if(cb.getSelectedItem().equals("Bahia")) {
            frete = 60;
        } 
        
    }//GEN-LAST:event_cbActionPerformed