A poplar tree was 3 feet high when it was planted on January 1, 1970. During what year did it pass the height of 20 feet

[BTGmoderatorDC]

A poplar tree was 3 feet high when it was planted on January 1, 1970. During what year did it pass the height of 20 feet?

(1) On January 1, 1973, it was 24 feet high.
(2) It doubled its height during each year.



OA B

Source: GMAT Prep