What percent of a book sale does the author usually get?

Strickly out of curiosity: Say that I wanted to publish a book. I find a reputable publisher to print and distribute it. Purchase price is set at whatever a regular book in whatever genre usually is. On average, how is the percentage of that price broken down into? What percent goes for supplies,... show more Strickly out of curiosity: Say that I wanted to publish a book. I find a reputable publisher to print and distribute it. Purchase price is set at whatever a regular book in whatever genre usually is. On average, how is the percentage of that price broken down into? What percent goes for supplies, editor's/publisher's share, and so forth?

What percentage of the purchase price actually reaches the author's pocket? Anyone know?
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