Answer:
c. $21,000
Explanation:
In this situation, Net worth can be defined as total assets minus liabilities, in the initial situation, the family's net worth is defined as the sum of liquid assets, use assets and investment assets minus liabilities:
![Net = 150,000+10,000+34,000 - 108000\\Net = 86,000](https://img.qammunity.org/2020/formulas/mathematics/middle-school/3584ddkrflnvtvzutt7p2kv67ghpjgzgjp.png)
If liabilities increase by $7,000, their new net worth would be $79,000.
Therefore, they would need to increase their assets by $21,000 in order to achieve a net worth of $100,000