Quantity Discount in eCart 5

Hello WA support people. I have tried to find an answer in the forum but had no lucky, that's why I'm posting this now.
I only have one product in my store that I need to sell. Key here is the quantity of items the buyer might purchase. So, I need to sell a product for $15, but if they get more than one the price goes down to $10 per product. Now the tricky part is that the first item would still need to be $15 and the rest $10. So, if they purchase 5 items, the final price would be $15 + $10 + $10 + $10 + $10 = $55
Any clue how to create the rule?
Thanks

You could just update the totalprice calculation from:

TotalPrice = [Price] * [Quantity]

to

TotalPrice = ([Price] * [Quantity]) - (5 * ([Quantity]-1))

Hi Ray, thanks for your response, for some reason I couldn't access webassist forums and that's why I'm answering just now, sorry about that. I will give it a try and let you know. Thanks again.

Here again Ray, though it sounds that this is the right answer I still cannot get how to implement it. I'm not an expert but I can handle it if you explain me what are the values to select from the trigger and action drop down menus. Also, I noticed you used a fixed number, I know you were just following my example, but what should I use to allow for any quantity? It could be 4 or 13 items. Thanks again.

This formula will work for any number of items.

Just open the eCart object and go to the calculations tab. Then select the TotalPrice calculation and copy and paste this as the value:

([Price] * [Quantity]) - (5 * ([Quantity]-1))

You are right, I just noticed that and should work perfect!!! I will try it right now, thanks again.

Hey Ray,
I tried the formula and noticed a few things:
1) the discount is not being displayed as Discounts on the cart created by the display manager. In this case, even though the calculation can be done in the calculation tab, it is important that is shown as discount.
2) I added one more item to the products to sell, I told you first I only had one item, now I have two sorry, and I see that the calculation is messed up, is doing the discount on the first and seconds items at the same time or something weird.

I guess I will need to open a ticket to further look into this. Sorry.

Instead of updating TotalPrice, you can create a new column:

TotalOff = (5 * ([Quantity]-1)

Then you can create a discount rule to discount the total of the TotalOff column. Then it won't be updated in the cart total but will add as a discount below.

How do you want the second item to work? Does it have the same discounts? What if you bought one of each?

Thanks Ray, I opened up a ticket and it's solved now.