In this example, the sales have increased 59.3% over the five‐year period while the cost of goods sold has increased only 55.9% and the operating expenses have increased only 57.5%. The trends look different if evaluated after four years. At the end of 20X0, the sales had increased almost 20%, but the cost of goods sold had increased 31%, and the operating expenses had increased almost 41%. These 20X0 trend percentages reflect an unfavorable impact on net income because costs increased at a faster rate than sales. The trend percentages for net income appear to be higher because the base year amount is much smaller than the other balances.