Question 1176907
380000=1900000(1-e^(-0.03t))
0.2=1-e^(-0.03t))
-0.8=-e^(-0.03t)
change both signs and take ln of both sides
-0.2231=-0.03t
t=7.4 days or 7 days
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for 80%
0.2=e^(-0.03t)
-1.61=-0.03t
t=54 days
{{{graph(300,300,-100,100,-200000,2000000,380000,1520000,1900000(1-e^(-0.03x)))}}}