fix bug

@@ -614,7 +614,7 @@ class BSWorkbook(Workbook):
                     price_total_str = license_dict.get('价税合计小写')
                     if rate_str is not None and price_total_str is not None:
                         try:
-                            rate = int(rate_str)
+                            rate = int(rate_str.rstrip('%'))
                             price_total = float(price_total_str)
                         except Exception as e:
                             pass