Answer
See below.
Work Step by Step
a) By plugging in $t=1$ into the formula: $P(1)=100(0.3)^{1}=30$
b) By plugging in $t=2$ into the formula: $P(2)=100(0.3)^{2}=9$
c) The meaning of it is that each year $30\%$ of the people survived and then survive again.
