Answer:
Industry Sales (2011) = 17,500,000
Industry Sales (2010) = Sales of 2011/1+growth = 17,500,000/1+17.7% = 17,500,000/1.177 = $14868309.26083263 = $14,868,309.26
Company Sales (2011) = 17,500,000 * 4.2% = $735,000
Company Sales (2010) = 14,868,309.26 * 5.9% = $877,230.25
Change in units = Company sales in 2011 - Company Sales in 2010 = $735,000 - $877,230.25 = $142,230.25
Change due to change in Industry growth = Company Sales in 2010 * 17.7% = $877,230.25 * 17.7% = 155,269.75
So, there is net increase of 155,269.75 units of sales due to industry growth.