import math
from __future__ import division
#initialisation of variables
t= 4.5*10**9 #years
t1= 1590 #years
#CALCULATIONS
l= math.log10(2)/(t*0.4343)
l1= math.log10(2)/(t1*0.4343)
r= l1/l
r1= t/t1
#RESULTS
print"disintegration constant=",'%.2E'%l,"yr^-1";
print"disintegration constant=",'%.2E'%l1,"yr^-1";
print"relative proportion=",'%.2E'%r;
print"relative proportion=",'%.2E'%r1;