Answer:
a. Amount of operating expenses recognized during the accounting period = Account payable closing balance + Cash payment - Opening balance
= $25,000 + $40,000 - $2,000
= $63,000
b. Net income earned during the accounting period = Cash revenue - Amount of operating expenses recognized
= $85,000 - $63,000
= $22,000
C. Amount of cash flow from operating activities = Net income + Increase in current liability
= $22,000 + ($25,000 - $2,000)
= $45,000