What was the Core and developed technology assets as a percentage of Total purchased intangible assets?
{"": {"Weighted Average Useful Life": "(in years)", "April 4, 2016": "(in millions)"}, "Core and developed technology": {"Weighted Average Useful Life": 11.0, "April 4, 2016": 1075.0}, "In-process research and development": {"Weighted Average Useful Life": "\u2014", "April 4, 2016": 140.7}, "Customer-related": {"Weighted Average Useful Life": 6.0, "April 4, 2016": 630.6}, "Backlog": {"Weighted Average Useful Life": 1.0, "April 4, 2016": 40.3}, "Other": {"Weighted Average Useful Life": 5.0, "April 4, 2016": 1.8}, "Total purchased intangible assets": {"Weighted Average Useful Life": "", "April 4, 2016": 1888.4}}
core_tech_assets = df["Core and developed technology"]["April 4, 2016"]
total_purchased_intangible_assets = df["Total purchased intangible assets"]["April 4, 2016"]
answer = core_tech_assets / total_purchased_intangible_assets * 100.0