The Table below reports the gross profit margins of Apple Inc together with an explanation provided by Apple Inc in their annual report for the increase in the gross profit margin from 31.5% in 2020 to 35.3% in 2021 . Products Gross Margin Products gross margin increased during 2021 compared to 2020 due primarily to higher Products volume, Required What is the most likely reason as to why gross profit margin would increase due to an increase in volume