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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def inasafe_place_value_percentage(number, total, feature, parent):
 """Given a number and total, it will return the percentage of the number to the total. For instance: * inasafe_place_value_percentage(inasafe_analysis_summary_field_value( 'female_displaced'), inasafe_analysis_summary_field_value('displaced')) -> will calculate the percentage of female displaced count to total displaced count. It also can be used by pure number (int, float). """

    _ = feature, parent  # NOQA
    if number < 0:
        return None
    percentage_format = '{percentage}%'
    percentage = round((float(number) / float(total)) * 100, 1)
    return percentage_format.format(percentage=percentage)