Well... Something is missing in this question.. As here u r asking to find out fall in demand so there should hve to be given some other information too like Ed should be given or anything else.. Plz check ur question once again

Understanding the Problem
To find the original expenditure when the new expenditure is Rs 180 and the price per unit is Rs 6, we need to first determine the quantity of goods purchased with the new expenditure.
Calculating Quantity with New Expenditure
- New Expenditure = Rs 180
- Price per Unit = Rs 6
- Quantity Purchased = New Expenditure / Price per Unit
- Quantity Purchased = 180 / 6 = 30 units
Calculating Original Expenditure
To find the original expenditure, we need to understand the percentage fall in demand. Let’s denote:
- Original Quantity = Q
- New Quantity = 30 units
Assuming a percentage fall in demand (let's say 'x%'), we can establish the relationship:
- New Quantity = Original Quantity * (1 - x/100)
This means:
- 30 = Q * (1 - x/100)
We can rearrange this to find the original quantity:
- Q = 30 / (1 - x/100)
Since we do not have the percentage fall in demand directly, we can express the original expenditure in terms of original quantity and price:
- Original Expenditure = Q * Price per Unit
- Original Expenditure = Q * 6
Conclusion
To find the exact original expenditure in Rs, we need the percentage fall in demand. However, with the current data, we can conclude that:
- If you know 'x', you can calculate Q and subsequently the original expenditure.
- Without 'x', an exact figure for original expenditure cannot be determined.
This approach allows you to analyze the impact of demand changes on expenditure effectively.