Configuring the collections strategy according to the number of days an invoice is overdue.

Summary:

I would like to understand how to configure collections strategy to achieve following outcome :-

Invoice Overdue	Task
15 days overdue	Dunning1
30 days overdue	call to customer
45 days overdue	Dunning2
60 days	call to customer
over 75 days	dunning 3

Please see above table as what I am trying to achieve and would like to know how to configure collections scoring assignment to achieve it. Which scoring formula can be utilised for this purpose?

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