Q: Palmer loves taking photos and has an album of 100 photos under her bed to mark memories of places she's been. She recently went on a long trip to Bali. Palmer took 50 new pictures in the first week and twice that many in the second week. She was running out of space at the end of her trip and took only 80 new photos total across the third and fourth weeks. If she adds the pictures from Bali to her collection, how many total photos does Palmer have under her bed now?
A: While in Bali, Palmer took 50 pictures in the first week and thus 2 * 50 photos = 100 photos in the second week. The total number of photos she took in Bali is 50 photos on the first week + 100 photos on the second week + 130 photos = 280 photos. When she adds the photos she from Bali to her album, Palmer has a total of 280 + 100 = 380 photos. The answer is 380.
Question: On a construction site, a mason has to build 6 courses of a wall, each having 10 bricks per course. He has to build 4 such walls and realized he won't be able to finish two courses of the last wall because there were not enough bricks. What's the total number of bricks that he has used?
Answer: If he has to build 4 walls, each having 6 courses, the total number of courses to be built is 4 * 6 = 24 courses. If each course has 10 bricks, then the total of bricks for the courses is 24 * 10 = 240 bricks. The total number of bricks missing to finish the last wall is 2 * 10 = 20 bricks. The total number of used bricks is 240 - 20 = 220 bricks. The answer is 220.
[Question]Aaron has four brothers. If the number of Bennett's brothers is two less than twice the number of Aaron's brothers, what is the number of Bennett's brothers?
[Answer]Twice the number of Aaron's brothers is 4 * 2 = 8. Bennett has 8 - 2 = 6 brothers. The answer is 6.
Q: There are 15 cats in a shelter. One-third were adopted, and were replaced with twice the amount that were adopted. Later on, twice as many dogs showed up as there are cats. How many total animals are there in the shelter?
A: 15 / 3 = 5 cats were adopted out of 15. There were 15 - 5 = 10 cats left. 5 * 2 = 10 more cats were added. This makes 10 + 10 = 20 cats in the shelter. 20 * 2 = 40 dogs came into the shelter. There are now 20 + 40 = 60 animals in the shelter. The answer is 60.
Question: Ahmed and Emily are having a contest to see who can get the best grade in the class. There have been 9 assignments and Ahmed has a 91 in the class. Emily has a 92. The final assignment is worth the same amount as all the other assignments. Emily got a 90 on the final assignment. What is the minimum grade Ahmed needs to get to beat Emily if all grades are whole numbers?
Answer: Ahmed has scored 819 total points in the class thus far because 9 x 91 = 819. Emily had scored 828 total points before the final assignments because 9 x 92 = 828. She scored 918 total points after the final assignment because 828 + 90 = 918. Ahmed needs to score a 99 to tie Emily for the semester because 918 - 819 = 99. Ahmed needs to score a 100 to beat Emily for the semester because 99 + 1 = 100. The answer is 100.
Q: The price of electricity went up by 25%. John's old computer used 800 watts and his new computer uses 50% more. If the old price of electricity was 12 cents per kilowatt-hour, how much does his computer cost, in dollars, to run for 50 hours?
A:

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
His new computer uses 800 * .5 = 400 watts more than his old computer. So it users 800 + 400 = 1200 watts. That is 1200 / 1000 = 1.2 kw. Electricity cost 12 * .25 = 3 cents more than it used to. So it now cost 12 + 3 = 15 cents per kwh. He used 1.2 * 50 = 60 kwh. So he paid 15 * 60 = 900 cents per kwh. So he paid 900 / 100 = $9. The answer is 9.