Step 1: Collect the 1987-88 data from the table:
Middle income: 40 thousand households, average income Rs. 30,000.
Upper-middle: 10 thousand households, average income Rs. 50,000.
High income: 5 thousand households, average income Rs. 75,000.
Step 2: Find the total income and total households:
Total households \(= 40 + 10 + 5 = 55\) thousand.
Total income \(= 40 \times 30{,}000 + 10 \times 50{,}000 + 5 \times 75{,}000 = 1{,}200{,}000 + 500{,}000 + 375{,}000 = 2{,}075{,}000\) (in thousands of rupees).
Step 3: Divide:
Average income \(= \dfrac{2{,}075{,}000}{55} = 37{,}727.27 \approx \text{Rs. } 37{,}727\).
Step 4: Check the options:
Rs. 37,277 is the same digits transposed and is a common slip. Rs. 35,000 does not arise from any correct method (the simple average of the three category incomes is 51,667, and the weighted average must be weighted by households). The household numbers are given, so the average can be determined.
Final Answer:
The correct option is (1): Rs. 37,727