25=9ln(1.8)(1.8^x)
(25/9)=ln(1.8^ x+1)
e^(25/9)=1.8^(x+1)
25/9=2.777777777...
e^2.7777777=16.0831155806775216863918087341 (approx)
take log(base100 av both sides
log[1.8^(x+1)]=(x+1)*log(1.8)=log(16.0831....)
so, x+1=log(16.0831)/log(1.8)....kan yuze NE base for the log
ln(16.083115580677216863918087341)=2.7777699999999
kall it 2.77777...kloes nuf
ln(1.8)=0.58778666490211897948228
so x+1=2.77777/0.5877866649...
x+1=4.7258132344029400...
x=3.72581323...