Financial Management

Hi goodmorning
I am worried because I am doing F9 online with opentuition and I do not understand
why in example 2, chap 3, page 25: new receivables are calculated on: 30days at 60% and 90 days at 40?
And in page 26 the new receivables are just calculated on one month over twelve= 1/12 of $1000000?
I would like the lecture to help if possible or someone else.
Would I be posting these questions on the forum?
I am sorry if I asking too much.
Thank you so very much.
Fatou88 e-mail: kattiaka@gmail.com
Iam very sorry because I sent an email to the team as I did not notice that there is a box on my left where it is written SUPPORT. BUT SINCE, i READ ALL AND i AM ABOUT TO UNDERSTAND