Currently in the application we don't have option to add "Charge calculation" as % interest for savings charges.
Eg. If 10000 is the balance in savings account and interest posted is 1000, then let us say collect 1% as tax from the interest (then it is 10).
> While creating the savings charge it self the Charge calculation dropdown should be displayed with %interest. and that charge should be allowed to utilize in the account also.