Marcel Must Temporarily Invest Some Extra Funds in His Retail

Short Answer

Marcel must temporarily invest some extra funds in his retail business every fall to purchase inventory in preparation for the Christmas season. On September 1 he already had a total of $57,000 invested in his business. On October 1 he invested another $15,000, and on November 1 he injected $27,000. He was able to withdraw $23,000 on February 1, $13,000 on March 1, and $6,000 on May 1. What was the average cumulative investment in the business during the period from September 1 to August 31? (Assume that each month has the same length.)