Answer
See below
Work Step by Step
Given:
$t=30\\
M=2700g\\
a=1.5\\
m_0=3g$
Obtain: $m(30)=(2700)[1-(1-\frac{3}{2700}^{\frac{1}{4}})e^{\frac{(-1.5)(30)}{4(2700)^{\frac{1}{4}}}}]^4 \approx 1271g$
The mass of the heron after 30 days is $1271$ g