How to sum over multiple fields in an array

i have a charges model that contain Price And Quantity , i want to multiply Price and Quantity and sum the results and update a table named bill with final results , here is my array

 [
  [
    "Title" => "Price 1",
    "Quantity" => "1",
    "Price" => "1",
  ],
  [
    "Title" => "Price 2",
    "Quantity" => "232",
    "Price" => "32632",
  ],
  [
    "Title" => "Price 3",
    "Quantity" => "11",
    "Price" => "2115",
  ],
]

via Chebli Mohamed