- Step 1: Identify Food's percentage. Food = 25% of total expenses.
- Step 2: Calculate Food expenses. Total = Rs. 20,000. Food = $25% \times 20,000 = 0.25 \times 20,000$.
- Step 3: Compute. $0.25 \times 20,000 = \frac{25}{100} \times 20,000 = \frac{1}{4} \times 20,000 = 5,000$.
- Step 4: Verify. Total percentages: $40 + 25 + 20 + 15 = 100%$. Food = $\frac{25}{100} \times 20,000 = 5,000$.
- Step 5: Compare with options. Options: (1) 4,000, (2) 5,000, (3) 6,000, (4) 7,000. Matches 5,000.
- Step 6: Cross-check. Rent = $40% \times 20,000 = 8,000$, Transport = $20% \times 20,000 = 4,000$, Others = $15% \times 20,000 = 3,000$. Total = $8,000 + 5,000 + 4,000 + 3,000 = 20,000$.
- Step 7: Conclusion. Option (2) is correct.