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The image you provided contains a table and formula related to price elasticity of demand. Here's the breakdown of the elements and how to solve it:

### Information from the Image:
1. **Table:**
   - \( Q_d \) (Quantity Demanded) and \( P \) (Price):
     | Qd (Quantity Demanded) | P (Price) |
     |------------------------|-----------|
     | 5                      | 3         |
     | 3                      | 5         |
     | 1                      | 7         |

2. **Formula for Elasticity of Price** \( E_p \):
   \[
   E_p = \frac{Q_2 - Q_1}{P_2 - P_1} \times \frac{P_2 + P_1}{Q_2 + Q_1}
   \]

3. **Questions:**
   - (a) Calculate the elasticity between \( P = 5 \) and \( P = 3 \).
   - (b) Calculate the elasticity between \( P = 3 \) and \( P = 7 \).

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### Step-by-Step Solutions:

#### (a) Elasticity between \( P = 5 \) and \( P = 3 \):
   - From the table:
     - When \( P = 5 \), \( Q = 3 \)
     - When \( P = 3 \), \( Q = 5 \)

   Plug into the formula:
   \[
   E_p = \frac{5 - 3}{3 - 5} \times \frac{3 + 5}{5 + 3} = \frac{2}{-2} \times \frac{8}{8} = -1
   \]
   The price elasticity is \( -1 \), indicating unitary elasticity.

#### (b) Elasticity between \( P = 3 \) and \( P = 7 \):
   - From the table:
     - When \( P = 3 \), \( Q = 5 \)
     - When \( P = 7 \), \( Q = 1 \)

   Plug into the formula:
   \[
   E_p = \frac{1 - 5}{7 - 3} \times \frac{7 + 3}{1 + 5} = \frac{-4}{4} \times \frac{10}{6} = -1 \times \frac{5}{3} = -\frac{5}{3} \approx -1.67
   \]
   The price elasticity is approximately \( -1.67 \), indicating elastic demand.

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Would you like further clarification or more details? Here are some related questions:

1. What does it mean when elasticity is negative?
2. How does unitary elasticity affect revenue?
3. How do we interpret elastic vs inelastic demand?
4. What other factors might influence the elasticity of a product?
5. Can elasticity be used to predict consumer behavior?

**Tip:** The greater the absolute value of elasticity, the more sensitive the quantity demanded is to changes in price.

Hitunglah elastisitas antara P = 5 dan P = 3, serta P = 3 dan P = 7 berdasarkan tabel harga dan jumlah permintaan (Qd).

Learn how to calculate price elasticity of demand using the midpoint formula between price points P=5, P=3, and P=7 with corresponding quantity demanded from the given table. This step-by-step solution covers essential economic concepts like unitary elasticity and elastic demand.

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