SOLUTION: Suppose you write a book. The printer charges $4 per book to print it, and you spend $3500.00 on advertising. You must sell the book for $15.00 a copy. How many copies must you

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Suppose you write a book. The printer charges $4 per book to print it, and you spend $3500.00 on advertising. You must sell the book for $15.00 a copy. How many copies must you       Log On


   



Question 391268: Suppose you write a book. The printer charges $4 per book to print it, and you spend $3500.00 on advertising. You must sell the book for $15.00 a copy. How many copies must you sell so that your income from the sales is greater than your total cost?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let c = costs
Let b = number of books sold
given:
c+=+4b+%2B+3500
--------------
15b+%3E+4b+%2B+3500
11b+%3E+3500
b+%3E+318
You must sell 319 books
check answer:
15b+%3E+4b+%2B+3500
15%2A319+%3E+4%2A319+%2B+3500
4785+%3E+1276+%2B+3500
4785+%3E+4776
OK
and with b+=+318
15%2A318+%3E+4%2A318+%2B+3500
4770+%3E+1272+%2B+3500
4770+%3E+4772 -not true
So, 318 is too small