K = 0.693/t1/2
= 0.693/1600
= 0.000433125 years^-1
K = 2.303/t log[A0]/[A]
0.000433125 = 2.303/t log8.8/3.5
t = 2.303/0.000433125log8.8/3.5
= 2.303*0.4004/0.000433125
= 2129 years >>>>answer
= 2.1*10^3 years
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