3. Shelton Corp., a local manufacturer, reported the following information for 2010: Sales Cost of Goods Sold 562,500 Operating Expenses 112,500 Income Tax Expense 22,500 What is Shelton Co.'s operating income? $750,000 a. $52,500 b. $75,000 c. $90,000 d. $187,500 e. $615,000