What number would I propose? Probably a negative one. I don't think "we can say that at least 50-75% is actually helping". On what basis? Helping with what?
They aren't engaging in good faith. You're better off not responding.
Saving $40k/person[0] is wonderful savings! Let's save even more! Boo yah! USA! USA! USA!
[0] I mean it's not like they're Americans. And they're most likely not white either. In which case, unless they're mowing my lawn or picking my cotton, they're worth essentially zero.
Did they ask them? I haven't seen evidence they did (if anything, the releases from the White House suggest DOGE became the tail that wags the dog, with OMB being asked to justify cuts to projects DOGE had already become convinced were waste, if they were consulted at all).
See I can ask questions too.
And the number I propose is 0%
Unfortunately, it's glacial for a reason; there's 380 million people in the country and 8 billion in the world. That's a lot of effect to weigh when making changes to the status quo.
There's a three-panel comic about a person deciding they need change in their life and getting it by taking a chainsaw to their room. Panel three is them looking around and going "oh no." That is, unfortunately, sort of how I conceptualize DOGE.