Use this income statement to answer the following questions. $6,000 3,400 2,600 Sales ($60 per unit) Less: Cost of goods sold ($34 per unit) Gross margin Less operating expenses: Salaries Advertising Shipping ($2 per unit) Operating Income $800 400 200 1,400 $1,200 Your answer is incorrect By how much would operating income change with a 10% increase in units sold? (Round answer to decimal places, eg. 152.) Operating Income $ 1440