Final answer:
The inflation rate can be calculated by finding the difference between the nominal GDP growth and the real GDP growth, and then dividing it by the real GDP growth. In this case, the inflation rate is 240%.
Step-by-step explanation:
The inflation rate can be calculated by finding the difference between the nominal GDP growth and the real GDP growth, and then dividing it by the real GDP growth. In this case, the nominal GDP rose from 600 to 770, which is an increase of 170. The real GDP rose from 500 to 550, which is an increase of 50. Therefore, the inflation rate is (170 - 50) / 50 = 240%.