To find the GDP (gross domestic product) gap you will take the actual unemployment rate and subtract it from the natural rate. Next you will multiply that by -2 to find the economy's negative GDP gap.
Okun's law states there is a -2% GDP gap for every -1% that the natural rate exceeds the current rate.
Following this equation:
(actual unemployment rate - natural unemployment rate)(-2)=GDP gap
(11-6)(-2) = 10%