Kim spends $25,000 to open a store. She makes $4000 a month in revenue and her expenses are $1500 a month. How long would it take to pay back the cost to open the store? Give me reasons, before answering the question

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 profit is 4000 - 1500 = $2500. So it takes 25000 / 2500 = 10 months to make back the money. So the final answer is 10.