The sentence refers to an action that occurred in the past, which means the verb must be in the past tense.
The correct sentence should be:
"He bought a new car yesterday."
Thus, the correct answer is (B) "bought."
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?