Mark Cotteleer owns a company that manufactures sailboats, Actual demand for Mark€™s sailboats during each season in 2006 through 2009 was as follows:

Mark has forecasted that annual demand for his sailboats in 2011 will equal 5,600 sailboats. Based on this data and the multiplicative seasonal model, what will the demand level be for Mark€™s sailboats in the spring of2011?

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Year Season Winter Spring Summer Fall 2006 1,400 1,500 2007 1,200 1,400 1,0002,100 750 2008 1,000 1,600 2,000 650 2009 900 1,500 1,900 500 600