Question: Daleyza won a house construction project that involved the construction of three houses with several units. The first building was designed to have 4000 units, the second building 2/5 times as many units as the first building, and the third building was to have 20% more units than the second building. How many units were Daleyza contracted to build?
Answer: If the first building was designed to have 4000 units, the second building, which had 2 / 5 times as many units as the first building, was to have 2 / 5 * 4000 = 1600 more units. Together, the first and the second building had to have 1600 + 4000 = 5600. The third building was to have 120 / 100 * 1600 = 1920 units. Altogether, Daleyza won a project that required her to construct 5600 + 1920 = 7520 units. The answer is 7520.

Question: Wendy's truck has a gas tank that can hold 20 gallons. She also has a car with a gas tank that holds 12 gallons. The truck's tank is half full. The car's tank is 1/3 full. If she fills them both up completely, how many gallons does she add?
Answer: The truck tank has 10 gallons in it because 20 x .5 = 10. The car tank has 4 gallons in it because 12 x (1 / 3) = 4. She needs to add 10 gallons to the truck because 20 - 10 = 10. She needs to add 8 gallons to the car because 12 - 4 = 8. She needs to add 18 gallons in total because 10 + 8 = 18. The answer is 18.

Question: Janet is getting paid to moderate social media posts. She gets paid 25 cents per post she checks. If it takes her 10 seconds to check a post, how much does she earn per hour?
Answer: First find the number of seconds in an hour: 1 hour * 60 minutes / hour * 60 seconds / minute = 3600 seconds / hour. Then divide the total number of seconds per hour by the number of seconds it takes Janet to read one post: 3600 seconds / hour / 10 seconds / post = 360 posts / hour. Then multiply the number of posts she checks per hour by her pay per post to find her hourly pay: $0.25 / post * 360 posts / hour = $90 / hour. The answer is 90.

Question: Tonya has $150.00 on her credit card. If she leaves any balance on her card at the end of the month, she is charged 20% interest. If she makes a $50.00 payment on her card, what will be the new balance?
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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Her card has a $150.00 balance and she makes a $50.00 payment so the new balance is 150 - 50 = $100.00. She didn't pay it off so she is charged 20% interest on her $100.00 balance so the interest is .20 * 100 = $20.00. Her balance was $100.00 and she was charged $20.00 in interest so her new balance is 100 + 20 = $120.00. The answer is 120.