My question is: Marcel bought a pen for $4, and a briefcase for five times the price. How much did Marcel pay for both items? Your thoughts:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
The cost of the briefcase was 5 * 4 = $20. So for both items Marcel paid 4 + 20 = $24. The final answer: 24.