Answer
21 weeks
Work Step by Step
$t = 1/c * ln (A/(A-N))$
$c=.03$
$N =30$
$A = 65$
$t = 1/c * ln (A/(A-N))$
$t = 1/.03 * ln (65/(65-30))$
$t = 33.333* ln (65/35)$
$t =33.333* .619039$
$t=20.63$
21 weeks
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