def validate(data):
    score = 100

    calc_total = data["Taxable"] + data["CGST"] + data["SGST"] + data["IGST"]
    if abs(calc_total - data["Total"]) > 2:
        score -= 20

    if not data["GSTIN"]:
        score -= 15

    if not data["Invoice No"]:
        score -= 10

    data["Confidence"] = f"{score}%"
    return data