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The task involves finding the cross-elasticity of demand between different goods (barang X, Y, and Z), determining their relationships, and providing real-world examples.

### Explanation of the Task:

1. **Cross-elasticity of Demand (Koefisien Elastisitas Silang)**:
   This measures how the quantity demanded of one good changes in response to the price change of another good. The formula is:
   
   \[
   E_{XY} = \frac{\% \, \Delta Q_X}{\% \, \Delta P_Y} = \frac{\left(\frac{Q_X^2 - Q_X^1}{Q_X^1}\right)}{\left(\frac{P_Y^2 - P_Y^1}{P_Y^1}\right)}
   \]
   where:
   - \( E_{XY} \) = Cross-elasticity between X and Y,
   - \( \Delta Q_X \) = Change in quantity of good X,
   - \( \Delta P_Y \) = Change in price of good Y.

2. **Types of Relationships**:
   - **Substitute Goods**: Positive cross-elasticity. If the price of Y increases, the demand for X increases.
   - **Complementary Goods**: Negative cross-elasticity. If the price of Y increases, the demand for X decreases.

3. **Given Data (Sebelum & Sesudah)**:
   - **Y**: Harga changes from 30 to 20, Jumlah from 300 to 400.
   - **X**: Harga is constant at 10, Jumlah changes from 150 to 100.
   - **Z**: Harga changes from 15 to 20, Jumlah from 100 to 90.

### Solution Steps for Part 1:
1. **Calculate Cross-Elasticity Between X and Y**:
   \[
   E_{XY} = \frac{\left(\frac{100 - 150}{150}\right)}{\left(\frac{20 - 30}{30}\right)}
   \]

2. **Interpret the Relationship**:
   Based on the sign of the cross-elasticity, identify if the goods are substitutes or complements.

3. **Provide Real-World Example**:
   After identifying the type of relationship (e.g., substitutes like tea and coffee), provide a suitable example.

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Would you like me to solve the entire question step-by-step or provide more details about cross-elasticity? 

### Related Questions:
1. How do changes in the price of substitute goods affect demand elasticity?
2. What are examples of complementary goods with high cross-elasticity?
3. What is the significance of negative cross-elasticity in economic theory?


Calculate the cross-elasticity of demand between goods X and Y; determine the type of relationship between them, and provide real-world examples.

Learn how to calculate the cross-elasticity of demand between goods X and Y using a detailed step-by-step process. This problem covers key economics concepts like elasticity and types of goods relationships. Suitable for undergraduate economics students.

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