Suppose you write a book. A printer charges $4 per book to print it and you spend $3500 on advertising. You sell the book for $15 a copy. How many copies must you sell so that your income from sales is greater than your total cost?

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Answer 1 · 2018-03-13T05:54:07

You need to sell at least #319# books.

You earn #$11# per book because

#$15-$4=$11#

Your other cost is advertising. You must sell at least

#($3500)/("$11/book")#

or #318.2# books to offset that cost. Therefore, you must sell at least #319# books.