2021 · Q54
A tree is at present 9 feet tall. If every year it grows ath of its height, what will be the height of the tree after three years?
general-mental-abilityquantitative-aptitude
- A12 feet
- B12.34 feet
- C13 feet
- D13.10 feet
Explanation
The tree grows by one-ninth of its height each year, so after three years its height is 9 x (10/9)³. Since (10/9)³ = 1000/729 ≈ 1.3717, the height becomes 9 x 1.3717 ≈ 12.34 feet. The other options do not match this compound growth. Hence the height after three years is 12.34 feet.