Showing dropdown value sum on form page

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1

I have several dropdowns. Each dropdown option is worth a specific value. I need those values to be added up on the page while they are selecting them.

Random example, each item being it’s own dropdown menu and each number being an option:
Baskets: 1
Gloves: 3
Jars: 2
Shears: 5
=11 items (this is the part I need)

2 
$w("#dropdown1,  #dropdown2, #dropdown3, #dropdown4").onChange( (event) => {
let sumValue = $w("#dropdown1").value + $w("#dropdown2").value + $w("#dropdown3").value + $w("#dropdown4").value;
$w("#textbox1").text = sumValue.toString();
})