I need to determine how to calculate the blank columns on the spreadsheet below.

Month	Profit	Cost of Goods	Total Revenue	Profit as a % of COGS	% Increase/Decrease in Profit Over Time	Change in COGS	% Increase/Decrease in cost over time
January	-18920	23920	$5,000.00			0
February	-16420	23920	$7,500.00			0
March	-1420	23920	$22,500.00			0
April	-11420	23920	$12,500.00			0
May	-10960	18460	$7,500.00			0
June	4040	18460	$22,500.00			0
July	5405	17095	$22,500.00			1365
August	7905	17095	$25,000.00			0
September	12905	17095	$30,000.00			0
October	12905	17095	$30,000.00			0
November	12905	17095	$30,000.00			0
December	12905	17095	$30,000.00			0