Answer:
16%
Explanation:
the actual rate of unemployment is 8% higher than the natural rate of unemployment (= 13% - 5%), which means that cyclical unemployment is very high. Okun's law basically uses a rule of thumb where you need 2% economic growth rate to lower 1% of the unemployment rate (2 to 1 relationship).
So the GDP gap in percentage points = 8% unemployment higher than natural rate x 2 = 16%