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To solve this question, we can use the concept of percentage decrease needed to counteract a price increase so that the total expenditure remains the same.

Let:
- Original price of the commodity = 100 (for simplicity).
- New price after a 30% increase = 100 + 30 = 130.

To keep the expenditure constant, the consumption needs to be reduced proportionally to offset this increase in price.

The percentage reduction in consumption, \( r \), is calculated as:
\[
r = \frac{\text{increase in price}}{\text{new price}} \times 100
\]

Substitute the values:
\[
r = \frac{30}{130} \times 100 = 23.08\%
\]

### Answer:
The percentage of consumption that should be reduced is **23.08%**.

Would you like more details on how this calculation is done, or do you have any questions?

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Here are 5 related questions that expand on this concept:

1. How would the required percentage reduction change if the price increased by 50% instead?
2. If the price decreased by 30%, how much should the consumption increase to keep the expenditure constant?
3. How do you calculate percentage change when multiple consecutive price increases occur?
4. What is the general formula for calculating reduction in consumption given any percentage price increase?
5. How would this concept apply if both price and consumption increased?

**Tip:** When dealing with percentage change problems, it often helps to assume a base value (like 100) for easier calculation.

The price of a commodity increased by 30%. To keep the expenditure the same, how much percentage of consumption should be reduced?

Find out how much consumption should be reduced to maintain constant expenditure when the price of a commodity increases by 30%. This problem covers essential percentage change concepts and proportional adjustment calculations, suitable for students in Grades 8-10.

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