Tara's parents gave her $90 for her birthday. Not wanting to spend it, Tara put the money in a new bank account that gains 10% interest annually. If she doesn't withdraw the money at all, how much will she have after a year? Let's think first. Chain of thought:

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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In one year, Tara's account will yield an interest of 10 / 100 * 90 = 9 dollars. The total in her account will therefore be 90 + 9 = 99 dollars.
Therefore, the answer is 99.