Given:
Actual price of a violin is $1,250
Credit card monthly payment as $150.
Initial payment is $300.
![\text{Total money paid by Ruben for violin=300+(150}*9)](https://img.qammunity.org/2023/formulas/mathematics/college/x1q8lw626o14jn12ql6erogodvf2lgp1tx.png)
![\text{Total money paid by Ruben for violin=300+}1350](https://img.qammunity.org/2023/formulas/mathematics/college/o3f75or9qc45mw1lyf647gghlu6cb8avpg.png)
![\text{Total money paid by Ruben for violin= \$1650}](https://img.qammunity.org/2023/formulas/mathematics/college/9ryh7chnkbwgndb2swr7079gself6o68b9.png)
The difference between the total amount Ruben pays for the violin, including the initial payment and the credit card payments, and the sale price of the violin:
![\text{Diffference amount=1650-1250}](https://img.qammunity.org/2023/formulas/mathematics/college/2efremrx29q338zb1cttqi4rrk98tyg2x2.png)
![\text{Diffference amount= \$400}](https://img.qammunity.org/2023/formulas/mathematics/college/xujgp3ryatgvrgq8lqa61yorbeuedfbqsi.png)
Difference amount is $400.