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 it when the tree was planted?
1. 432 cm
2. 324 cm
3. 375 cm
4. 400 cm
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Let initial height = h
After 1 year, height = {(100+20)/100}×h = 1.2h
After 2 years, height = {(100+20)/100}×1.2h = 1.44h
1.44h = 540 cm
h = 540/1.44 = 375 cm
Its height was 375cm
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