If the Consumer Price Index (CPI) was 140.

Comprehensive and Detailed Explanation From Exact Extract:

The inflation rate is calculated by subtracting the previous year’s CPI from the current year’s CPI, dividing by the previous year’s CPI, and multiplying by 100. In this case:

(146.9 - 140.6) / 140.6 = 6.3 / 140.6 ≈ 0.0448 or 4.48%.

The feedback from the document confirms:

"To calculate the rate of inflation over a period of time one must subtract the CPI at the beginning of the period from the CPI at the end of the period and then divide the result by the CPI at the beginning of the period. In this example, the solution can be derived as follows: (146.9 - 140.6) / 140.6."