A = A0-0.00693x
Here, A0 = 600 lbs and A = 198 lbs
198 = 600*e(-0.00693*x)
198 / 600 = e-0.00693*x
33 / 100 = e-0.00693*x
Taking natural log both the sides
ln (33/100) = ln ( e-0.00693*x)
ln (33/100) = -0.00693*x ln e
ln (33/100) = -0.00693*x
ln e = 1
x = -0.00693 / ln (33/100)
x = 160 years Answer
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