based off my calculations the gross profit margin is 74.53% and the net profit margin is 44.57%

Question 5:

Compare Alibaba Group's gross profit margin ratio and net profit margin ratio that you calculated following ratios from Amazon, eBay, and JD.com for the year ended December 31, 2013.

a. From the perspective of their business models, provide explanations for the differences in gross profit ratios among Alibaba Group, Amazon, eBay, and JD.com.

b. Based on the net profit margin ratios of Alibaba Group, Amazon, eBay, and JD.com, determine whichmost profitable and which is the least profitable. Provide possible explanations for these differences in probability.