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प्रश्न
A mango tree was planted 3 years ago. The rate of growth is 20% per annum. If at present, the height of the tree is 1 m 8 cm, how high was it when planted?
उत्तर
Vn = 1m 8 cm = 108 cm; V0 = ? ; t = 2 years; r = 20 %
`"V"_"n" = "V"_0 (1 - "r"/100)^"n"`
108 cm = V0 `(1 + 20/100)^3`
V0 = 108cm x 0.8333 x 0.8333 x 0.8333
V0 = 62.5 = m
The height of tree was 62.5 cm when planted.
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