import re

def extract_scope(text, n):

    m = re.search(rf"Scope\s*{n}[^0-9]*(\d+\.?\d*)", text, re.I)

    return float(m.group(1)) if m else None


def extract_revenue(text):

    m = re.search(r"Revenue[^0-9]*(\d+\.?\d*)", text, re.I)

    return float(m.group(1)) if m else None


def carbon_intensity(scope1, revenue):

    if scope1 and revenue:

        return scope1 / revenue

    return None