Thank you for the opportunity to help you with your question! the solution is as such:
initially present means at t= 0, so we see at t=0, Q(t)= 300
now at t=0, Q(t) = 300
t=5, Q(t) = 385.20
t=10, Q(t) = 494.61
t=20, Q(t) = 815.4
t=100, Q(t) = 8.06 * 10^43
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