I have 4 discounts setup that apply the cart for my items. We are selling webinars at 75.00 per item. If a user buys five, they pay only for four. So, i set up a structure like this:
Five for Four (spend 375 get 75 off).
Ten for Eight: (spend 750 get 150 off)
Well, they work fine if I do QTY 5 (I get 75 off). They work fine when I do QTY 10 (I get 150 off). BUT, if I do QTY 8 the discount becomes 74.98. QTY 6 on the other hand has no impact. When they are off, they are off by a few cents (no more than five. Not sure how to deal with it.