algebra
posted by lille .
suppose you right a book. the 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?

costs= fixed cost + variable cost
income=15*books
if income is > than costs
15*B>3500+4B
11B>3500
B>327, so B must be 328 so that income is greater than costs.