Using the bar chart, which product has the highest total revenue across all four years? 
- Step 1: Calculate total revenue for Product X. Sum: $50 + 60 + 70 + 80 = 260$ lakhs.
- Step 2: Calculate total revenue for Product Y. Sum: $40 + 50 + 60 + 55 = 205$ lakhs.
- Step 3: Calculate total revenue for Product Z. Sum: $30 + 40 + 50 + 45 = 165$ lakhs.
- Step 4: Compare totals. Product X: 260, Product Y: 205, Product Z: 165. Product X has the highest total revenue.
- Step 5: Final conclusion. Option (1) Product X is the correct answer.





For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: