1. **State the problem:** Rehan buys a book and a pen and pays 50 for both. The book costs 8 more than twice the cost of the pen. We need to find the cost of the book. 2. **Define variables:** Let the cost of the pen be $x$. 3. **Express the cost of the book:** The book costs 8 more than twice the pen, so cost of book = $2x + 8$. 4. **Write the total cost equation:** Pen + Book = 50, so $$x + (2x + 8) = 50$$ 5. **Simplify the equation:** $$3x + 8 = 50$$ 6. **Solve for $x$:** $$3x = 50 - 8$$ $$3x = 42$$ $$x = \frac{42}{3} = 14$$ 7. **Find the cost of the book:** $$2x + 8 = 2(14) + 8 = 28 + 8 = 36$$ **Answer:** The cost of the book is 36.