If a Book Has a Royalty Rate of 15% and 12,000

If a book has a royalty rate of 15% and 12,000 copies are sold to bookstores at $50 each the bookstore returns 2000 unsold books to publishers, and the bookstore sells the books to students for $62.50 the author will be paid

A) $90,000 (.15*50*12,000) .
B) $75,000 (.15*50*10,000) .
C) $93,750 (.15*62.50*10,000) .
D) $112,500 (.15*62.50*12,000) .