Use the Pfizer and Merck 10-K's to compare and answer the following questions about each company's profitability. Copy and paste to your browser of each links below to open form 10-K for Pfizer and Merck.

https://www.sec.gov/ix?doc=/Archives/edgar/data/78003/000007800320000014/pfe-12312019x10kshell.htm

https://www.sec.gov/ix?doc=/Archives/edgar/data/310158/000031015820000005/mrk1231201910k.htm

a)What was each company's net profit margin for each of the past three years?

b)What was each company's gross profit margin for each of the past three years?

c)What was each company's return on equity for just the year ended 12/31/19?

d)Overall, which company do you believe is more profitable and why?