Question: Janet bought some muffins at the bakery. Each muffin is 75 cents. Janet paid $20 and got $11 in change back. How many muffins did Janet buy?
Answer: Janet paid with $20 and got back $11, so her muffins cost $20 - $11 = $9. Each muffin cost 75 cents, so she bought 9 / .75 = 12 muffins. The answer is 12.
[Question]Jack is ordering custom baseball caps for him and his two best friends. Jack's head is 12 inches in circumference. Charlie's head is 9 inches more than half the circumference of Jack's head. Bill's head is 2/3 the circumference of Charlie's head. How many inches in circumference is Bill's head?
[Answer]First find half the circumference of Jack's head: 12 inches / 2 = 6 inches. Then find how big Charlie's head is: 6 inches + 9 inches = 15 inches. Then find how big Bill's head is: 15 inches * 2 / 3 = 10 inches. The answer is 10.
Q: Andrew's dog has 12 burrs and six times as many ticks as burrs. How many foreign objects total are caught in the dog's fur?
A: First find how many burrs are caught in the dog's fur: 12 burrs * 6 ticks / burr = 72 ticks. Then add the number of burrs to find the total number objects: 72 objects + 12 objects = 84 objects. The answer is 84.
Question: Ali has a small flower shop. He sold 4 flowers on Monday, 8 flowers on Tuesday and on Friday, he sold double the number of flowers he sold on Monday. How many flowers does Ali sell?
Answer: Combining Tuesday and Monday, Ali sold 4 + 8 = 12 flowers. On Friday, he sold 2 * 4 = 8 flowers. Altogether, Ali sold 12 + 8 = 20 flowers. The answer is 20.
[Question]Frank has three less than half the number of cookies as Mike. Mike has three times as many cookies as Millie. If Millie has 4 cookies, how many cookies does Frank have?
[Answer]Mike has 4 * 3 = 12 cookies. Frank has 12 / 2 - 3 = 3 cookies. The answer is 3.
[Question]Tim decides to get animals for his zoo. He buys 3 goats for $400 each. He gets twice as many llamas which cost 50% more each. How much did he spend?
[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 goats cost 3 * 400 = $1200. He buys 3 * 2 = 6 llamas. Each llama cost 400 * 1.5 = $600. So he spends 600 * 6 = $3600 on llamas. So the total cost was 1200 + 3600 = $4800. The answer is 4800.