I can't find relevant tags for my question so I wonder if this is a good place to ask.
I wanted to ask this a long time ago but keep forgetting.
Let's suppose when shopping for 3 units of specific good with same price, I am being offered one of the following:
A) Get 20% off per unit
B) Get 20% for total purchase
Now let's suppose each unit's price is different while all else stays the same. Would that change anything?
Can you enlighten please?