a) The inverse demand function for taxi-apps is estimated to be p = 100-2Q. If the price increases from 20 to 30, then by how much does consumer surplus change?

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(a) The inverse demand function for taxi-apps is estimated to be \( p = 100 - 2Q \). If the price increases from 20 to 30, then by how much does consumer surplus change?

### Explanation:

To determine the change in consumer surplus when the price changes, we need to calculate the consumer surplus at both prices and find the difference.

1. **Consumer Surplus at \( p = 20 \):**
   - Solve for \( Q \) when \( p = 20 \):
     \[
     20 = 100 - 2Q \implies 2Q = 80 \implies Q = 40
     \]
   - Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 40 \):
     - Height of the triangle: \( 100 - 20 = 80 \)
     - Base of the triangle: \( Q = 40 \)
     - Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 40 \times 80 = 1600 \)

2. **Consumer Surplus at \( p = 30 \):**
   - Solve for \( Q \) when \( p = 30 \):
     \[
     30 = 100 - 2Q \implies 2Q = 70 \implies Q = 35
     \]
   - Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 35 \):
     - Height of the triangle: \( 100 - 30 = 70 \)
     - Base of the triangle: \( Q = 35 \)
     - Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 35 \times 70 = 1225 \)

3. **Change in Consumer Surplus:**
   - Change = Consumer Surplus at \( p = 30 \) - Consumer Surplus at \( p = 20 \)
   - Change = \( 1225 - 1600 = -375 \)

Thus, the
Transcribed Image Text:(a) The inverse demand function for taxi-apps is estimated to be \( p = 100 - 2Q \). If the price increases from 20 to 30, then by how much does consumer surplus change? ### Explanation: To determine the change in consumer surplus when the price changes, we need to calculate the consumer surplus at both prices and find the difference. 1. **Consumer Surplus at \( p = 20 \):** - Solve for \( Q \) when \( p = 20 \): \[ 20 = 100 - 2Q \implies 2Q = 80 \implies Q = 40 \] - Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 40 \): - Height of the triangle: \( 100 - 20 = 80 \) - Base of the triangle: \( Q = 40 \) - Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 40 \times 80 = 1600 \) 2. **Consumer Surplus at \( p = 30 \):** - Solve for \( Q \) when \( p = 30 \): \[ 30 = 100 - 2Q \implies 2Q = 70 \implies Q = 35 \] - Consumer surplus is the area of the triangle formed above the price line and below the demand curve from \( Q = 0 \) to \( Q = 35 \): - Height of the triangle: \( 100 - 30 = 70 \) - Base of the triangle: \( Q = 35 \) - Area (consumer surplus) = \(\frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 35 \times 70 = 1225 \) 3. **Change in Consumer Surplus:** - Change = Consumer Surplus at \( p = 30 \) - Consumer Surplus at \( p = 20 \) - Change = \( 1225 - 1600 = -375 \) Thus, the
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