What was the change in the gross profit between the first and second quarter?
{"Net sales": {"First Quarter": 1212.5, "Second Quarter": 1432.5, "Third Quarter": 1374.7, "Fourth Quarter": 1329.8, "Total": 5349.5}, "Gross profit": {"First Quarter": 642.0, "Second Quarter": 689.3, "Third Quarter": 779.6, "Fourth Quarter": 820.5, "Total": 2931.3}, "Operating income": {"First Quarter": 132.3, "Second Quarter": 102.7, "Third Quarter": 194.7, "Fourth Quarter": 284.6, "Total": 714.3}, "Net income from continuing operations": {"First Quarter": 35.7, "Second Quarter": 96.3, "Third Quarter": 49.2, "Fourth Quarter": 174.7, "Total": 355.9}, "Diluted net income per common share": {"First Quarter": 0.14, "Second Quarter": 0.38, "Third Quarter": 0.2, "Fourth Quarter": 0.7, "Total": 1.42}}
gross_profit_2 = df["Gross profit"]["Second Quarter"]
gross_profit_1 = df["Gross profit"]["First Quarter"]
answer = gross_profit_2 - gross_profit_1