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The height of a tree increases every year 1/8 times. If the present height of the tree is 64 cm, then what will be its height after 2 yr?

76 cm
80 cm
81 cm
84 cm

Correct Answer: 81 cm

Explanation:

Percentage growth = (1/8) x 100 % = 12.5%
Height after 2 yr = 64 x (1+ 12.5/100)²
= 64 x (9/8) x (9/8) = 81 cm

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