The time between the 2 dates is 11.5 mo

323 = 298ek11.5

1.08389 = ek11.5

k = 7.0X10-3  mo-1

200 = 298e7.0X(10-3)t

t = 9.59 mo earlier



Aug. 16 1978 is 44 months earlier

298 = N0e7X(10-3)X44

298 = N0 (1.36)

N0 = 219

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