Answer
a) Numerical Estimation:
for $x=25$: $f(25)\approx76.158$
for $x=100$: $f(100)\approx19.502$
for $x=400$: $f(400)\approx0.0828$
for $x=1600$: $f(1600)\approx2.866\times10^{-11}$
$\lim\limits_{t \to \infty}p(t)=0$
b) $y=0$
c) This mathematical model shows that the percentage of people goes to $0$%, the higher the income they earn
Work Step by Step
a) Direct calculations
b) Observation of the graph
c) Direct answer
