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For example, if you increased your budget from $100 to $200 at noon, we'd aim to spend $100 for the rest of that day. This is because the day is half over, so we divide the $200 by 2. If, however, you decreased your budget from $100 to $50 at noon, we'd aim to spend $25 for the rest of that day. This is because the day is half over, so we divide $50 by 2.