How much was General and Administrative in 2019 as a percentage of the total in 2019?
{"Cost of revenues": {"2019": 723, "2018": 653, "2017": 374}, "Research and development": {"2019": 2061, "2018": 1471, "2017": 1033}, "Selling and marketing": {"2019": 2863, "2018": 2314, "2017": 1655}, "General and administrative": {"2019": 5382, "2018": 4860, "2017": 4771}, "": {"2019": 11029, "2018": 9298, "2017": 7833}}
general_2019 = df["General and administrative"]["2019"]
total_2019 = df[""]["2019"]
answer = ( general_2019 / total_2019 ) * 100.0