Hello, I am working with .awk files in the Ubuntu linux command line. I thought I answered the questions correctly, but my teacher said I should not submit the commands, she wants to see the scripts. So, here are the questions, could you please help me write the scripts?

Task1: Write an awk script that will output the sum of all the sales figures.

Input file (hw0409.csv)	Example output
Name,Emp ID,Sales,Dept,Resi Andrew,24,88,Eng,Y Brandon,66,14,Mkt,Y Chelsey,8,,Eng,N Deborah,38,,Ift,Y Erik,32,13,Mkt,N Arielle,13,48,Eng,N Shaun,55,78,Ift,N Ninette,3,24,Opr,Y Nguyen,10,54,Eng,Y	SUM: 319

Task2: Write an awk script that will output the average of all the sales figures.

Input file (hw0409.csv)	Example output
Name,Emp ID,Sales,Dept,Resi Andrew,24,88,Eng,Y Brandon,66,14,Mkt,Y Chelsey,8,,Eng,N Deborah,38,,Ift,Y Erik,32,13,Mkt,N Arielle,13,48,Eng,N Shaun,55,78,Ift,N Ninette,3,24,Opr,Y Nguyen,10,54,Eng,Y	AVG: 35.4444

Thank you!!