What is the value of the company's trademarks and tradenames as a percentage of its total intangible assets in 2018?
{"Trademarks and tradenames (Retail Segment)": {"September 2019": 500000, "September 2018": 3373269}, "ustomer relationships (Wholesale Segment) (less accumulated amortization of approximately $2.1 million at both September 2019 and September 2018)": {"September 2019": "\u2014", "September 2018": 41667}, "": {"September 2019": 500000, "September 2018": 3414936}}
trademarks_and_tradenames_2018 = df["Trademarks and tradenames (Retail Segment)"]["September 2018"]
total_intangible_assets_2018 = df[""]["September 2018"]
answer = trademarks_and_tradenames_2018 / total_intangible_assets_2018 * 100.0