What is the value of municipal bonds as a percentage of the total marketable securities?
{"Cash equivalents": {"Level 1": 10155, "Level 2": 10000, "Level 3": "-", "Total": 20155}, "Marketable securities: -- Municipal bonds": {"Level 1": "$\u2014", "Level 2": 44705, "Level 3": "\u2014", "Total": 44705}, "Marketable securities: -- Corporate bonds": {"Level 1": "\u2014", "Level 2": 48296, "Level 3": "\u2014", "Total": 48296}, "Marketable securities: -- Total marketable securities": {"Level 1": "$\u2014", "Level 2": 93001, "Level 3": "\u2014", "Total": 93001}, "Marketable securities: -- Investments in privately-held companies (1)": {"Level 1": "$\u2014", "Level 2": "\u2014", "Level 3": 3390, "Total": 3390}}
marketable_securities_municipal_bonds = df["Marketable securities: -- Municipal bonds"]["Level 2"]
marketable_securities_total = df["Marketable securities: -- Total marketable securities"]["Level 2"]
answer = marketable_securities_municipal_bonds / marketable_securities_total * 100.0