Final answer:
The inflation rate is calculated using the percentage change formula, resulting in a rate of 10.5 percent when rounded to one decimal place.
Step-by-step explanation:
The question is asking to calculate the inflation rate based on the given price indexes for two consecutive years. The price index went from 190 to 210. To find the inflation rate, you can use the formula for percentage change, which is: (New Value - Old Value) / Old Value × 100%. Applying this formula, the inflation rate is calculated as:
((210 - 190) / 190) × 100% = (20 / 190) × 100% = 10.53%.
Therefore, when rounded to one decimal place, the correct answer is 10.5 percent, corresponding to option b.