How to figure out COGS and Inventory?

*Downstream invenotry transaction
On January 2, 2021, Penn Company purchased 80% of the outstanding common shares of Senn Company.
During 2021, Penn Company sold merchandise that cost $2,700 to Senn Company for $3,600.
Senn Co. sold all but $600 of this merchandise to its customers for $3,700 on account.
Senn Co. reported net income of $3,000 and Penn reported separate operating income (excluding income from Senn Co.) of $5,000 during 2021.
Q1.	Prepare eliminating (consolidation) entries for intercompany transactions on December 31, 2021.
	Account	Debit	Credit
	Sales revenue	3,600
	COGS		2,700
	Inventory		900
Q2.	What is the consolidated net income?
Answer:	7,100
Q3.	what is the net income attributable to NCI (NCI in NI)?
Answer:	600
Q4.	What is the Net Income attributable to Controlling Interest (Controlling Interest Net Income)?
Answer:	7,700
Q5.	Based on the information above, please complete the following worksheet.
			Penn Co.		Senn Co.		Consolidation Entries
					DR		CR		Consolidated
	Income Statement
	Sales		35,000		10,000		3,600				41,400
	Less: COGS		(22,500)		(6,000)		900		3,600		(25,800)
	Othr expenses		(7,500)		(1,000)						(8,500)
	Income from Senn Co.		0				0				0
	Consolidated Net Income	5,000		3,000		3,600		3,600		7,100
	NCI in Net Income						600				600
	Controlling Interest in Net Income	5,000		3,000		4,200		3,600		7,700
	Balance sheet
	Inventory		7,000		5,000				900		11,100