Answer:
Retained earnings for year 1 would be lower by $6000
Step-by-step explanation:
A change in inventory valuation method resulted in higher cost of goods sold for the previous year.
This means had the new method of inventory valuation i.e weighted average been followed, the gross profit would have been lower by $10,000.
Had gross profits been lower by $10,000 , it would've led to net income being lower by $10,000. After deduction of 40% tax rate on such income, the after tax income would've been $6000 lower.
This further means the balance of retained earnings would've been reduced by $6000.