The table below shows the index numbers for the cost of a basket of goods and services in each period. Use this information to calculate the inflation rate for each period. Round to two decimal places.
Index Number | Inflation Rate | |
Period 1 | 100 | - |
Period 2 | 106 | |
Period 3 | 109 | |
Period 4 | 113 |
The inflation rate can be calculated as follows:
Index Number | Inflation Rate (compared to previous year) | Inflation Rate (compared to base year) - optional | |
Period 1 | 100 | -- | -- |
Period 2 | 106 | 6% | 6% |
Period 3 | 109 | 2.83% | 9% |
Period 4 | 113 | 3.67% | 13% |
Note: For Period 1, inflation cannot be calculated as there is no previous year. Period 1 is the base year.
For other periods, inflation can be calculated in two ways:
Generally, inflation is measured compared to the previous year.
The formula used is:
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