Question

A papaya tree was planted 2 years ago. It increases at the rate of 20% every year. If at present, the height of the tree is 540 cm, what was its height when the tree was planted?

• A. 400 cm
• B. 375 cm
• C. 324 cm
• D. 432 cm

Answer 1

Answer: (B)

375 cm

Answer 2

Let the height at time of plantation be h.
At present the height is 540 cm

$\Rightarrow$ 540 = $\frac{6}{5}\times \frac{6}{5}\times h$

$\Rightarrow$ $\frac{36}{25h} = 540$
h = $540\times \frac{25}{36}$

= 375 cm

Therefore, The correct option is (B): 375 cm.