log(X/10) = log(10/X) + 2
log( X / 10 ) = log( 10 / X ) + 2
log(X) - log(10) = log(10) - log(X) + 2
2·log(X) = 2·log(10) + 2
log(X) = log(10) + 1
log(X) = 1 + 1
log(X) = 2
X = 102
