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The image shows a table with the "Consumer Price Index (CPI)" for various years, along with a question asking to calculate the change in the index from 1980 to 2010 as a percentage.

### Given Table:
| Year | Consumer Price Index (CPI) |
|------|----------------------------|
| 1980 | 82                         |
| 1990 | 130                        |
| 2000 | 172                        |
| 2010 | 219                        |

### Problem Statement:
- Calculate the percentage change in the CPI from 1980 to 2010.

### Solution:
The formula for percentage change is:

\[
\text{Percentage Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100
\]

Here:
- New Value (CPI in 2010) = 219
- Old Value (CPI in 1980) = 82

\[
\text{Percentage Change} = \frac{219 - 82}{82} \times 100
\]

\[
\text{Percentage Change} = \frac{137}{82} \times 100 \approx 167.07\%
\]

The Consumer Price Index increased by approximately **167.07%** from 1980 to 2010.

Would you like more details on the calculation or have any other questions?

### Related Questions:
1. What factors contribute to changes in the Consumer Price Index over time?
2. How can the CPI impact the economy and individual purchasing power?
3. What other indices can be used to measure inflation?
4. How do you calculate the average annual inflation rate given the CPI data?
5. What was the percentage increase in CPI from 1990 to 2000 based on the given table?

### Tip:
When calculating percentage changes, always ensure that you're subtracting the old value from the new value before dividing, to get the correct direction of the change.

Calculate the change in the Consumer Price Index (CPI) from 1980 to 2010 as a percentage.

Learn how to calculate the percentage change in the Consumer Price Index (CPI) from 1980 to 2010 using the formula for percentage change. Understand the impact of inflation and price variations over time, with a step-by-step solution that is suitable for high school students.

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