or.. you could do it without the requirement for a Process by making Rate a Reference Attribute in Writer and having a Shortcut Attribute pointing to Rate.Amount it in the Writer Object, and include the Shortcut Attribute in Queries/Reports for Writer.
In this scenario you would of course have to select the rate via a dropdown or enter a new one, which would build a "rate table", having the advantage of extra flexibility in that you could say that Writer 'Bob' is on the same rate as Writer 'Sam'.
Or, more practically, it would allow you to setup different types of rate 'tiers'/groups to select from.. eg. 'Default', 'Tier 1 Skilled Writers', 'Novice Writers'.