Answer
$g\approx 1.04842$ and $r\approx 0.04842$
Work Step by Step
Here, we have $V(g)=1000g^3+1000g^2+1000g+1000=4300$
or, $g^3+g^2+g-3.3=0$
Thus, the function is
$f(x)=x^3+x^2+x-3.3$
Thus, $x\approx 1.04842$
The real solution of the equation is $g\approx 1.04842$
Now, we have $g=1+r$
Then $1+r \approx 1.04842$
This gives: $r\approx 0.04842$
Hence, $g\approx 1.04842$ and $r\approx 0.04842$