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Let's solve the problem from **Question 14** together, focusing on the increase in consumer surplus when the price decreases from $22 to $16.

### Explanation:
1. **Consumer Surplus** is the area between the demand curve and the price level, up to the quantity traded.
2. When the price decreases, the consumer surplus increases by the area of the triangle that is formed between the old and new price levels, bounded by the demand curve.

From the graph:
- The price decreases from $22 to $16.
- The quantity traded at $22 seems to be **50** units.
- The quantity traded at $16 seems to be **90** units.

### Step-by-Step Calculation:
The increase in consumer surplus is given by the area of the triangle with:
- **Height**: The difference in price ($22 - $16 = $6).
- **Base**: The difference in quantity (90 - 50 = 40).

So, the increase in consumer surplus is the area of this triangle:
\[
\text{Area} = \frac{1}{2} \times \text{base} \times \text{height} = \frac{1}{2} \times 40 \times 6 = 120.
\]

Thus, the correct answer is **$120**.

If you have any questions or would like more details on this, feel free to ask! Here are five related questions that expand on this topic:

1. What is the definition of consumer surplus and how is it represented graphically?
2. How does a shift in demand or supply affect consumer and producer surplus?
3. Can the consumer surplus decrease if price increases? How would the graph change?
4. What are the implications of a price ceiling on consumer surplus?
5. How do taxes affect consumer and producer surplus?

**Tip:** Always remember that the increase or decrease in consumer surplus can be found by calculating the area of the shape (triangle or trapezoid) formed between the old and new price levels.

Refer to Figure 7-6. If the price decreases from $22 to $16, by how much would consumer surplus increase?

This problem involves calculating the increase in consumer surplus when the price decreases from $22 to $16 using the area of a triangle formula. Based on Figure 7-6, we determine the change in surplus by analyzing price and quantity changes.

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