kompound interest...yu ask for time tu "quadrupel"
that meen (end $) / (start $=4
dont need the start $...not a fakter heer
monthly kompound...konvert 1.0325 tu 1.0027083, but kompound 12 times a yeer
thus, 1.0027083^numpound=4
take logs...numpound*log(1.0027083)=log(4)
numpound=log(4) / log(1.0027083)
log(4)=0.602059991
log(1.0027083)=0.001174609864
numpound=512.56 or about 513
12 months per yeer, so thats 42.7 yeers