Answer:
Net Cash flow from Operating activities $120
Step-by-step explanation:
The preparation of the Cash Flows from Operating Activities - Direct Method is shown below: 
Cash flow from Operating activities - Direct method 
Cash received from customers $1,800
Interest on investments $200
Interest on debt -$300
Income tax -$80
Purchase of inventory -$1,000
Operating expenses -$500
Net Cash flow from Operating activities $120