A firms balance sheets for year-end 2011 and 2012 contain the following data. All items are in millions of dollars.

	Dec. 31, 2011	Dec. 31, 2012
Accounts receivable	36.9	33.8
Inventories	30.9	26.8
Accounts payable	26.9	13.8

a.	Calculate the net working capital in 2011. (Enter your answer in millions rounded to 1 decimal place.)

Net working capital

$ million

b.	Calculate the net working capital in 2012. (Enter your answer in millions rounded to 1 decimal place.)

Net working capital

$ million

c.	What happened to investment in net working capital during 2012? (Input the amount as a positive value. Enter your answer in millions rounded to 1 decimal place.)

Net working capital has (Click to select) increased decreased by $ million.