How can I divide the following? resolved

[DarknessTAOH]

I have this value in String: $F{usuariosservicio_imporAgua}

I convert it to double: Double.valueOf($F{usuariosservicio_imporAgua})

How can I perform this operation?

13*Double.valueOf($F{usuariosservicio_imporAgua})/100

t shows me an error in the operator: /

Example: 13*29.17/100= 3.79

I already solved it, just ignore the error and run my report, it worked without problems.