Margo donated $4300 to Jayden's fundraising campaign. If Julie donated $4700 to Jayden's campaign, What's half the difference in the amount they contributed? 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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If Julie donated $4700 to Jayden's campaign, and Margo donated $4300, the difference in their contribution is $4700 - $4300 = $400. Half the difference in the amount they contributed is 1 / 2 * $400 = $200. So the final answer is 200.