Hildebrand Corp had the following current asset and current liability account balances for 2007 through 2010. Given:
In Millions of $	2010	2009	2008	2007
Cash & Equivalents	$807,926	$560,960	$617,866	$658,255
Short Term Investments	178,994	197,408	182,442	614,513
Cash and Short Term Investments	986,920	758,368	800,308	1,272,768
Accounts Receivable	2,028,060	2,365,823	2,341,609	2,302,447
Inventories	1,456,271	1,441,024	1,450,258	1,262,308
Total Current Assets	4,471,251	4,565,215	4,592,175	4,837,523
Accounts Payable	1,138,770	1,601,413	1,584,959	1,416,367
Accrued Expenses	878,454	901,546	902,164	863,683
Notes Payable/Short Term Debt	1,038,633	789,285	979,675	821,126
Current Port. of LT Debt	531,635	386,879	303,214	248,028
Total Current Liabilities	$3,587,492	$3,679,123	$3,770,012	$3,349,204

a) Compute Hildebrand's operating net working capital for 2007-2010?

b) What is the annual change in operating net working capital for the sample period?

c) Analyze the firm's need for additional capital to support its need for operating working capital.