Javascript shopping cart logic

Question

I have a javascript function that currently adds the item price (of a product, in this case pizza) into a shopping cart and then multiplies it by the quantity of items to return the total amount. This part works fine however I now need functionality to be able to change the price of each additional item after the first to $5. Right now I can only seem to change them all to $5 but not each additional one after the original as seen below in the second code block. How can I get this to work?

The original function (which works like a charm)

 getItemTotal(item) {
  let total = item.price * item.quantity;
  item.options.forEach(option => (total += option.value * item.quantity));
  return total;
   }

My solution (which changes every item price to $5 and not each additional item after the first item)

getItemTotal(item) {
if(item.tags == "pizza"){
  item.price = 5;
}

Answer 1

@user269867 was correct in assuring me that this code will work.

 if (item.tags == "pizza"&&(item.quantity >2 )) { item.price = 5;}

I just had to adjust the item.price based upon the condition multiple times for it to work in my use case.

 if(item.tags == "pizza" && item.quantity === 2){
  item.price = 4.99;
 }
 else if (item.tags == "pizza" && item.quantity === 3){
      item.price = 4.65;
    }`

Thanks for listening :)