help me doing this

Using Okun's Law, calculate the gap between potential output and actual output in a hypothetical economy in 2019 and 2020, writing billions of dollars to one decimal place e.g. $1.0 billion. In your answers, assume a natural unemployment rate of 5.5%. Enter the answer after rounding off to 1 decimal place. a. In 2019, the unemployment rate was 6.3% and real GDP in 2017 dollars was $1,656.2 billion. Therefore GDP In 2017 dollars could have been $3 1billion higher. b. In 2020, the unemployment rate was 7.4% and real GDP in 2017 dollars was $1,625.8 billion. Therefore GDP in 2017 dollars could have been $ billion higher