The simple interest, I, is given by the formula;
[tex]\begin{gathered} I=\frac{PRT}{100} \\ \text{where P represents the Principal} \\ R\text{ represents Rate} \\ T\text{ represents Time} \end{gathered}[/tex]From the question, we are provided with the following;
P= $195,000, R= 4.3%, T=30 years
Thus,
[tex]\begin{gathered} I=\frac{195,000\times4.3\times30}{100} \\ I=\frac{25155000}{100} \\ I=251,550 \end{gathered}[/tex]Hence, the interest after 30 years is $ 251,550