O Predictive value 4. If 20 units of a good (x) can be purchased by 4JDs in Jan,1,2018, assuming the inflation during 2018 reflected prices of all goods and services. At Dec 31, 2018 the 4JDs purchased only 15 units of the good (x), then general price index equals: (2 Points) 127% O 174% O 135% 120%