Basic formula- where the constant A is the initial value of x, the constant b is a positive growth factor, and τ is the time constant—the time required for x to increase by one factor of b: If τ > 0 and b > 1, then x has exponential growth.
In our case here, with every time factor, values are increasing wit approximately 64.18% of the previous value.
Eg- f(1)/f(2) = 3.62/5.63 = 0.642 = 64 % appx
value at f(6) can be calculated by using percentage basics, i.e. what will be the future value if present value increases by 64%
f(6) = 21.22*1.64 = 34.80
similarly,
f(7) = 34.80*1.64 = 57.07
hene, the option B will be our answer if we approximate our values.
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