While filtering in Radgrid column and using special character "%" it is not searching using "%", simply searching by other text.

Suppose we are filtering using "30%", but the results are shown as it is only 30. 
While debugging I found out that the used sql query becomes like following

like '%30%%'

In this the percentage symbol just after 30 is the symbol passed from UI but query considers as if we are looking for 30.