150 375 750 apply becomes buys cart cents deal decimal digits discount discounts divide eight entities few five four impact individually item items order pay paypal proportionately qty selling setup spend structure ten total user value webinars workaround

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)
etc....

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.

Since we don't have any way to pass discounts to PayPal as individually entities, we've based our discounts structure such that the total order discount is proportionately taken out of each item.

When you divide 75 by 8, you don't get a value which has more than 2 digits after the decimal (9.375) and so the total discount given is off by a few cents. Unfortunately, there is no workaround.