The followings are balances of accounts to prepare income statement. Two-year data has been provided. Based on this information, answer the following question. Hawaii Travel Account Balances Administrative expenses Jan. 2016 Jan. 2015 $5,000 $5,000 4,000 3,500 Cost of goods sold Interest expense 10,000 7,000 Interest income 10,000 12,000 Loss on sale of 1,000 700 equipment Net sales 60,000 45,000 Selling expenses 10,000 8,000 Income Tax 8,000 6,500 How much is the percent change in operating income in 2016 compared to 2015? (see horizontal analysis).