Answer:
Lisa has a net worth of $1200.
Step-by-step explanation:
Net worth of a person is defined as his total assets minus total liabilities. Assets are his personal things that he owns and liabilities are to be paid off.
Assets here are : car, saving account, cash and video camera.
Liabilities are : car loan and credit card
So, total assets will be = 
Total liabilities are = 
So, net worth will be = 
Hence, Lisa has a net worth of $1200.