.
You may use fingers of your hand (hands) to complete this assignment on your own.
Your first step is to read the problem attentively.
If its meaning eludes from your understanding after first reading,
then read it again and again until the idea of the solution will become clear to you.
Good luck (!)
Happy solving (!)
Remember that you can use fingers of your hand (your hands).
Also, you may use your pen or your pencil to make your marks on a page of paper while you move forward.
Couple of hints to your attention:
40% of 5 days from Monday to Friday comprise 2 full days.
Monday and Friday together comprise 2 full days.
Having these hints, boldly go forward.
Now you are equipped enough with my instructions to complete this problem on your own . . .
What a great gift from me to you (!) (!) (!)
Don't know what would you do without my help . . .