Answer :
12^r = 13
Take the logarithm of each side of the equation:
r log(12) = log(13)
Divide each side by log(12) :
r = log(13) / log(12) = 1.03221,,, (rounded)
Take the logarithm of each side of the equation:
r log(12) = log(13)
Divide each side by log(12) :
r = log(13) / log(12) = 1.03221,,, (rounded)