[Question]A clothing store sells 20 shirts and 10 pairs of jeans. A shirt costs $10 each and a pair of jeans costs twice as much. How much will the clothing store earn if all shirts and jeans are sold?
[Answer]Twenty shirts amount to $10 x 20 = $200. The cost of each pair of jeans is $10 x 2 = $20. So 10 pairs of jeans amount to $20 x 10 = $200. Therefore, the store will earn $200 + $200 = $400 if all shirts and jeans are sold. The answer is 400.
Q: In 6 months Bella and Bob will be celebrating their 4th anniversary. How many months ago did they celebrate their 2nd anniversary?
A: First, we find their current point in time be realizing that 4 years is 4 sets of 12 months, meaning at that anniversary they will have been together 4 * 12 = 48 months. Then, we subtract their 6 month difference, finding they are at 48 - 6 = 42 months into their relationship. Since 2 years would be 2 * 12 = 24 months into the relationship. We take the larger number, 42, and subtract the smaller number, 24 to find the difference in months, meaning it is 42 - 24 = 18 months. The answer is 18.
Question: Itzayana is 4 inches taller than Zora, who is 8 inches shorter than Brixton. If Zara is 64 inches tall and has the same height as Brixton, calculate the average height of the four people.
Answer: Since Brixton has the same height as Zara which is 64 inches, Zora, who is 8 inches shorter than Brixton, is 64 - 8 = 56 inches tall. Zara and Brixton's height is 64 + 64 = 128 inches. If you add Zora's height, the three have a total height of 128 + 56 = 184. Itzayana is 4 inches taller than Zoran which means she is 56 + 4 = 60 inches tall. The total height of the four friends is 60 + 184 = 244. The average height of the three is 244 / 4 = 61. The answer is 61.
[Question]Margaux owns a money lending company. Her friend pays her $5 per day, her brother $8 per day, and her cousin $4 per day. How much money will she collect after 7 days?
[Answer]Her friend will pay $5 x 7 = $35 after 7 days. Her brother will pay $8 x 7 = $56 after 7 days. Her cousin will pay $4 x 7 = $28 after 7 days. Therefore, she will be able to collect $35 + $56 + $28 = $119 after 7 days. The answer is 119.
Q: James takes 20 units per semester at community college. If each unit costs $50 how much does he pay for 2 semesters?
A: He pays 20 * 50 = $1000 per semester. So he pays 1000 * 2 = $2000. The answer is 2000.
Question: John uses 5 liters of fuel per km to travel. How many liters of fuel should John plan to use if he plans to travel on two trips of 30 km and 20 km?
Answer:

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.
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The first trip will use 30 * 5 = 150 liters of fuel. The second trip will use 20 * 5 = 100 liters of fuel. The total liters of fuel are 150 + 100 = 250 liters. The answer is 250.