variable price based on quantity orderd

Site URL: https://drinkmixy.co

Note: My site shop is currently disabled, but I can make it active if anyone needs to view the actual site to understand my concerns. 

I'm trying to figure out the best way to automatically discount the price of my product based on the quantity ordered. 

For example, 1 for $16, 2 for $30, etc. I originally set this up as a pricing variant on my product. However, I see two issues with this:

1) I do not think it will automatically update my inventory when a customer orders.

2) In the checkout page, there are two different areas that say "quantity." One of them is a dropdown menu. When a customer adjusts the quantity on the dropdown menu, this discounted price structure doesn't apply.  

3) In the picture of the shopping cart below, the customer has adjusted quantity to 4. Then, if they want to adjust the quantity from the shopping cart, they can't just add a single item. Instead, when they adjust the quantity to 2, it adds 8 more (4 x 2), instead of 4 + 1. Ah! Not sure if this make sense, but hopefully in the picture you can see the issue. 

I understand that automatic discounts can be applied on the commerce advance plan. However, I'm wondering: 

1. Is there a better way to set up this price structure automatically, other than using price variants? 
2. If I need to use the price variant, how can the discount be applied when a customer adjusts the quantity in their cart? 

Any guidance, insight, or solutions is much appreciated! 

Cheers!

Meredith

I have the same question. Did you figure this one out??

I HAVE THE SAME QUESTION.