Laravel Eloquent sum of multiplied columns

$amount = Transaction::select(DB::raw('sum(jumlah * harga) as total'))-&gt;get();

$amount = Transaction::sum(\DB::raw('jumla * harga'));

$amount = Transaction::all()-&gt;sum(function($t){ 
    return $t-&gt;jumlah * $t-&gt;harga; 
});

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