Final answer:
The inflation rate can be calculated using the percentage change formula. In this case, the inflation rate is 6%.
Step-by-step explanation:
To calculate the inflation rate, we use the formula: (New CPI - Old CPI) / Old CPI * 100%. Given that the consumer price index (CPI) was 100 in the base year and 106 in the following year, the inflation rate would be (106 - 100) / 100 * 100% = 6%. Therefore, the correct answer is option b) 6 percent.