First, find the total amount of money that they will pay.
Since each year has 12 months, then, there are 240 months in 20 years.
Since each month they pay $795.20, after 20 years they would have paid a total of:
![240*795.20=190,848](https://img.qammunity.org/2023/formulas/mathematics/college/l20ty5lziw4j16h8k2n16rbqouqfzsrh6v.png)
They have also paid $10,000 initially. Then, the total money spent in the house is:
![190,848+10,000=200,848](https://img.qammunity.org/2023/formulas/mathematics/college/4aku2g333i6pqmcbxw45tmhn670c0sgrou.png)
The value of the house is $80,000. Subtract $80,000 from the total amount of money that they have paid to find the total amount of interest:
![200,848-80,000=120,848](https://img.qammunity.org/2023/formulas/mathematics/college/ezl12ll8ep2u0x2b49ufgvi0784t0ve6r8.png)
Therefore, the total amount of interest that the Blacks will pay is $120,848.