Inventory options for quantity discounts - Shopify Lite.

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I have a product that sells for $6 each or 4 for $20. What is the best way to set this up with inventory tracking? So if one bottle sells, qty. 1 comes out of inventory, if the by four option is selected, 4 come out of inventory. 

I can see the inventory in a variant I tried setting up, but I believe it is treating the variant as qty. 1 instead of qty. 4. 

I am just  getting started and I only have Shopify Lite, but this would be very handy for the Facebook and POS channels. I appreciate any help you  can give.