mysql> create table DemoTable1844
     (
     Number int,
     TotalNumber int
     );
Query OK, 0 rows affected (0.00 sec)

mysql> insert into DemoTable1844 values(50,500);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1844 values(80,500);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1844 values(98,500);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1844 values(45,500);
Query OK, 1 row affected (0.00 sec)

mysql> select * from DemoTable1844;

+--------+-------------+
| Number | TotalNumber |
+--------+-------------+
| 50 | 500 |
| 80 | 500 |
| 98 | 500 |
| 45 | 500 |
+--------+-------------+
4 rows in set (0.00 sec)

mysql> select concat(round(((Number / TotalNumber) * 100 ),2), '%') as Result from DemoTable1844;

+--------+
| Result |
+--------+
| 10.00% |
| 16.00% |
| 19.60% |
| 9.00% |
+--------+
4 rows in set (0.00 sec)