Selected data (in thousands) from the income statement of H55 Inc. are shown below. Using vertical analysis, calculate the percentage of the base amount 2018 Percentage 2017 Percentage Amount Amount Net sales $1,907 % $2,057 Cost of goods sold 1,616 1,690 Gross profit 291 367 Operating expenses 219 210 Income before income tax 72 157 Income tax expense Profit