Newbie question. How do I access data to manipulate it in another column?

PWH

I have retrieved my data and have it displayed in 2 columns. I have managed to add a third column. I want to take the data held in column 2 cell and eventually manipulate it with a cell outside the table result in column 3.
To learn, I have just tried to multiply the 'adjacent column 2 by 10'. i.e 0.00000040 * 10 etc. I get the answer NaN for all rows in column 3. If I do '10 * 10', I get the expected answer of 100 in all rows of column 3. So what am I doing wrong trying to access the wanted data? (item 1). The structure of the data from console.log is:

(80) […]
0: (2) […]
        0: "BTC"
        1: "0.00000040"
length: 2
<prototype>: Array []
1: (2) […]
         0: "XMR"
         1: "0.00000020"
length: 2
<prototype>: Array []
2: (2) […]
     0: "LTC"
     1: "0.00000030"
length: 2
<prototype>: Array []
3: Array [ "SUMO", "0.00000000" ]
4: Array [ "ETN", "75.00000000" ]
5: Array [ "AEON", "0.00000000" ]

//etc, etc to 80
​
length: 80
<prototype>: Array []

The code is

$(document).ready(function() {
 var table = $('#example').dataTable( {
            columns: [
            { result: '' },
            { result: '' },
            { 
            "data": null, 
                      //for example
            "render": function(data,type,row) { return (data["BTC"] * 10)}
            }
            ],
            
        "ajax": {
            "url": "balances.txt",      // Load the TXT file
            "dataSrc": function (data) {
      
                var result = [];
                for(var i in data.balances)
                result.push([i, data.balances [i]]);
              
                console.log(result); // show it in the console
            return result;
    }
  }
} );

} );

Thank you for your help

PWH

Found the answer in the end..Alter line 19 and add an extra { '' : '' } in columns.

result.push([i, data.balances[i], data.balances[i] * spotRate ] );//gives data in 3 columns