Royalty percentages can vary widely depending on the context. Generally speaking, royalty percentages are usually based on a percentage of net proceeds, meaning a percentage of the net revenue received from selling or licensing a work.
For example, authors may typically receive between 5-15% of the cover price of a book in royalties, which works out to be approximately the same percentage of the publisher's net revenue from the book. When it comes to copyright, royalties are usually a percentage of the revenue generated from licensing or distributing content such as books, music or films. The rate of royalty percentages in such cases can vary substantially, but is usually negotiated on a case-by-case basis.
For example, when it comes to licensing music, royalties may be based on the number of records sold or even the total number of plays on streaming platforms. In some cases, the royalty rate may also depend on the type of platform being used.
In other cases, royalty percentages can be set per contract. For example, if you license your music exclusively to a label or film distributor, they may take a percentage of the total revenue generated as the royalty rate. The royalty rate will depend on the terms of the contract, and each case may be handled differently depending on the individual's situation.
As you can see, the typical royalty percentage is largely dependent on the context and the terms of the contract or agreement. Generally speaking, it's best to negotiate a royalty percentage based on your specific needs and situation.