# A primary root grows from 5 cm to 19 cm in a week. Calculate the growth rate and relative growth rate over the period.

Ans.

Absolute Growth rate can be calculated as follows:

Where W1 = final Size (weight, height, number etc.)
W0 = initial Size at the beginning of the period
r = growth rate
t= time of growth
e = base of natural logarithms
Here, r is the relative growth rate
Given W1 = 19 cm
W0 = 5 cm
t =7 days
or,
Using W1 = W0 ert

Then
Then
Then taking log on both the sides,

Then,

Or
Relative growth rate can be calculated as follows:

r = 3.8 cm
Absolute growth rate
Relative growth rate

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