Converting multiple columns string into number

Dear Community

I am using CSV file reader to import the data. The dataset has multiple columns with values as follows:

Column1, Column2, Column3, Column4

Row0 35%, 100%, 99%, 87%

Row1 45%, 100%, 86%, 93% and so on

These columns are imported categorizing as string and i am unable to change the data type as number in transform tab in CSV reader.

Is there any node which changes the type of data in these columns into numbers in one go?

Regards