Has Nike's gross profit rate improved since FYE 5/31/16? What is causing the change? Reading MD&A will help you here.

5/31/16: 46.24%

5/31/17: 44.58%

5/31/18: 43.84%

Has Nike's net profit margin ratio improved since FYE 5/31/16?

What is causing the change? Looking at items after gross margin will help you here.

5/31/16: 11.61%

5/31/17: 12.34%

5/31/18: 5.31%

Help with answering highlighted portion. I have calculated the percentages necessary for assistance. In depth explanation of why and how please