Apr. 16, 1978 to Apr. 1, 1979 is 11.5 months.
Relative to now (t = 0), t = -11.5 mo.

ln (298/323) = -k(11.5)
k = 7.0X10-3 mo-1


ln(200/323) = 7X10-3t
t = -68.5 mo
i.e., 68.5 months before Apr. 1, 1979

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