Answer-
If he had paid the loan in 7 years instead of 10 years, he could have saved $2437.50
Solution-
As we are not provided with the compounding rate, so considering as simple interest with 3.25% annual interest rate.
we know,
![i=(P* R* t)/(100)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/psi3v42f8pumjg5un00iu40f54utqcmuc8.png)
For 10 years,
![i_1=(25000* 3.25* 10)/(100)=8125](https://img.qammunity.org/2019/formulas/mathematics/middle-school/7vb596gtnbmmt06mal692w7qty9exb7yb9.png)
For 7 years,
![i_2=(25000* 3.25* 7)/(100)=5687.50](https://img.qammunity.org/2019/formulas/mathematics/middle-school/8muep2jtmhjfpwhpppmc66al0cdn8dav3z.png)
The extra interest paid by him is,
![=8125-5687.50=2437.5](https://img.qammunity.org/2019/formulas/mathematics/middle-school/rtfrm331y8kizvhzwognrnpzdpcjfnw6f2.png)
Therefore, if he had paid the loan in 7 years instead of 10 years, he could have saved $2437.50