printing enlarged photos

I have a question, I'm not really used to printing large, i've only done it once before and it was mostly digital text.
I have a photo taken by a 10MP camera, I enlarged it 150% at 300 ppi and now when it's viewed in Photoshop at a 100% zoom, the interpolation is starting to show, however if it's zoomed at 50-70% the quality is acceptable.
My question is, when taken to the printers, will it print at the quality I see at 100% zoom on screen or lower?Cause if it will print at the quality I see when zoomed at 70% or lower I can live with.
Thanks for answering

In the View Options select to view it in Print Size. Thats what it is going to look like. If it's blurred, interpolated, pixelated, etc. thats what you're going to get.

it's viewing fine in print size .thanks for answering