1. With Rational Functions
Solving Word Problems
With Rational Functions

2. Minds On Page 287 #11 Basic premise
Selling price - cost price = profit
R(x) - C(x) = P(x)

3. Setting it up Determine the cost per book
Let x represent the number of books she purchased.
The cost per book will be

4. Setting it up She gives 15 to her brother and sells the rest for $330
Her revenue per book will be 330
x-15

5. Equation Revenue - Cost = Profit R(x) - C(x) = P(x)
330/x /x = 1.5
Solve for x to determine the number of comic books in the box. Substitute this answer into the cost expression to get the original price of each book.