Greenwich Industries has forecasted its monthly needs for working capital (net of spontaneous sources, such as accounts payable) for 2010 as follows: Month Amount Month Amount January $7,500,000 July $6,000,000 February 6,000,000 August 7,500,000 March 3,000,000 September 8,500,000 April 2,500,000 October 9,000,000 May 3,500,000 November 9,500,000 June 4,500,000 December 9,000,000 Short-term borrowing (that is, a bank line of credit) costs the company 10 percent and long-term borrowing (that is, term loans) costs the company 12 percent. Any funds in excess of its monthly needs can be invested in interest-bearing marketable securities to yield 8 percent per annum