The correct answer is "hit," as it fits the simple past tense for a completed action in this context. The sentence describes a past action without any indication of ongoing or repeated action.
Thus, the correct verb form is "hit," making the sentence: "The car hit the tree."
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?