Lizzy: A monitor is 21 inches by 12 inches. There are 100 dots per inch. How many total pixels are there?.
Me: Hmmm, let me think. I think this is the detailed solution:

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 display is 21 * 100 = 2100 pixels across. The display is 12 * 100 = 1200 pixels tall. That means there is a total of 2100 * 1200 = 2,520,000 pixels. Final answer: 2520000.