There’s a 20% floor in Washington to share in the 14 proportional delegates.
50% gets all 3 delegates of the 10 CDs. You have to hit 20% to get a delegate if a candidate falls below 50% in a CD.
Realistically, Trumps should sweep all 44 delegates under these rules.
Correction. The statewide allocation will leave some delegates unbound if, for example, Trump ends up at 70% and Cruz and Kaisich end up with 15% each.
So best guestimate is somewhere between 38 and 42 or so delegates for Trump with a handful 2-6 unbound depending on what percentage Trump hits.
Your most likely range:
between roughly 61% and 68% will get 9 of 14.
between roughly 68% and 75% will get 10 of 14.
between roughly 75% and 82% will get 11 of 14.