'sum nested data with swift

I am trying to sum nested data without success. This is my data:

        {
        "BON_PK" = 34;
        "BON_EXTRA" = "100.00";
        Line = ({ "LIG_PRICE" = "40.80";},
                { "LIG_PRICE" = "40.80";})             
        },
       {
        "BON_PK" = 35;
        "BON_EXTRA" = "10.00";
        Line = ({"LIG_PRICE" = "40.80";},
                {"LIG_PRICE" = "40.80";})})

This is what I tried:

vPrice = vArr.map {$0?.Line!.map {(($0.LIG_PRICE as NSString).floatValue)}}.reduce(0, +)

This one is working but not the nested one:

vDelTotal = vArrBon.map { ($0?.BON_EXTRA!.toFloat)! }.reduce(0, +)

I created a 'toFloat' Function that is not working with the nested one. I have this error message:

Cannot convert value of type '[Float]?' to closure result type 'Float'

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'sum nested data with swift

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