Hi I feel confused about this question, and can you help me answer it and give me a full explanation?

COMMON SIZE ANALYSIS

2019

2018

2017

Sales

100.00%

100.0%

100.0%

Cost of Sales

47.0%

45.2%

43.0%

Gross Profit

53.0%

54.8%

57.0%

Other expenses

16.2%

18.0%

20.0%

Operating profit

36.8%

36.8%

37.0%

Interest

4.6%

2.9%

1.5%

Profit before Tax

32.2%

33.9%

35.5%

Tax expense

9.6%

10.2%

10.7%

Net Profit

22.6%

23.7%

24.8%

(a)Explain how this analysis helps you assess the performance of WeRHere4U.

(b)Does this analysis explain how Pete has been able to achieve the excellent results? If so, how? If not, why not?