Sum of a calculation, is it possible

[JuanCar29]

It is possible to make a sum from the multiplication of 2 columns. I have tried creating an attribute, but it doesn't work.

[JuanCar29]

I have managed to do it

$data = Trend::model(Sale::class)
->between(
start: now()->startOfMonth()->subMonth(),
end: now()->endOfMonth()->subMonth(),
)
->perDay()
->sum('precio * cantidad');