If the publisher cut is 40% of the cover price, your final royalty rates will be the following:

* 12% if you receive 30% net.
* 14% if you receive 35% net.
* 16% if you receive 40% net.
* 18% if you receive 45% net.
* 20% if you receive 50% net.

If the publisher cut is 50% of the cover price, your final royalty rates will be the following:

* 15% if you receive 30% net.
* 17.5% if you receive 35% net.
* 20% if you receive 40% net.
* 22.5% if you receive 45% net.
* 25% if you receive 50% net.

If the publisher cut is 60% of the cover price, your final royalty rates will be the following:

* 18% if you receive 30% net.
* 21% if you receive 35% net.
* 24% if you receive 40% net.
* 27% if you receive 45% net.
* 30% if you receive 50% net.

Amazon & Fictionwise (to the best of my knowledge) have a standard cut of 50%. All Romance Ebooks has 60%. Some publishers may have better deals (awesome!) but this is a reasonable baseline.