https://file.aiquickdraw.com/mathbot/file/1726717743127wowhc59u.jpg

In the image, there are two tables showing the prices and quantities of various goods (such as eggs, chicken, lele, onions, and sugar) for the years 2019, 2020, and 2021. The task requires calculating the inflation rate for 2021 using the formula based on the **Lespeyres price index**. 

### Key Observations:
1. **Lespeyres Price Index Formula**:
   \[
   I = \frac{\sum P_n Q_n}{\sum P_0 Q_n} \times 100
   \]
   Where:
   - \( P_n \) = Prices in the current year (2021).
   - \( P_0 \) = Prices in the base year (2019).
   - \( Q_n \) = Quantities in the current year (2021).

2. **Data from the Image**:
   - The price and quantity of goods (Telur, D. Ayam, Lele, Bawang, Gula) for the years 2019, 2020, and 2021 are given.
   - The index values for 2020 and 2021 have already been calculated as 104.49% and 104.08%.

To calculate the **inflation rate** for 2021, we need the percentage change in the price index from 2020 to 2021, which is:
\[
\text{Inflation Rate} = \frac{I_{2021} - I_{2020}}{I_{2020}} \times 100
\]
Given:
- \( I_{2020} = 104.49 \)
- \( I_{2021} = 104.08 \)

Thus:
\[
\text{Inflation Rate} = \frac{104.08 - 104.49}{104.49} \times 100 = -0.39\%
\]

The negative value indicates **deflation** (a slight decrease in prices) from 2020 to 2021.

Would you like further details on how the Lespeyres index works, or have any specific questions about the calculation?

### Further Related Questions:
1. How would you calculate inflation using a different index, like Paasche's?
2. What causes inflation or deflation in an economy?
3. How does the choice of base year affect the index calculation?
4. Can inflation be zero, and what does that signify for an economy?
5. What are the implications of deflation in a year like 2021?

**Tip:** Always compare multiple indices (e.g., Laspeyres, Paasche) to understand different economic trends better.

Hitung laju inflasi tahun 2021 menggunakan rumus Lespeyres.

Learn how to calculate the inflation rate for 2021 using the Lespeyres Index formula. This problem involves calculating the price index of goods such as eggs, chicken, lele, onions, and sugar over the years 2019 to 2021. Suitable for high school students studying inflation and economics.

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