Explanation:

- Start with the original length (L) and breadth (B).

- First change:

- Increase length by 40%: New length = 1.4L

- Decrease breadth by 50%: New breadth = 0.5B

- New area after first change = 1.4L * 0.5B = 0.7LB

- Second change (repeat the process):

- Increase new length by 40%: New length = 1.4 * 1.4L = 1.96L

- Decrease new breadth by 50% again: New breadth = 0.5 * 0.5B = 0.25B

- New area after second change = 1.96L * 0.25B = 0.49LB

- Compare with original area (LB):

- Change in area = (0.49LB - LB) / LB = -0.51 or -51%

- Conclusion: The area decreases by 51%.

- Correct Option: 51%

Option: 4 - 51%

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