if The Phillips curve equation is: t=t-1-0.2(u-un)+. In the current year the inflation rate was at 3% higher than forecast, and the actual unemployment rate exceeded the natural rate by 5%. The natural rate of unemployment remained unchanged. Determine which rate of inflation (%) was caused by unpredictable external shock.

(Write a number with one decimal point separated by a dot, but without the % sign and a dot at the end. For example: 3.7)