The correct sentence is ”Lata is not as tall as Sudha.” This is the grammatically correct way to express a comparison of height between two people.
Thus, the correct sentence is: ”Lata is not as tall as Sudha.”
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?