They give you the following formula:
R = log(A/Ao)
Where:
R = 4.2
log = Natural log
We need to solve for A, so:
Take the exponential function to both sides:
e^(4.2) = e^log(A/Ao)
66.68 = A/Ao
Multiply both sides by Ao
A = 66.7Ao
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