well, I would live too. assume a family, no kids, makes 125K. to simplify things we will assume no other deductions. under the current tax system they will receive $12700 STD deduct + $4050x2 personal deduct. their adj income then is about $104K. their tax obligation would be about $19,400. 

under the new proposed plan, the std deduct is $24K with no personal deduct, that brings their adj income to about $101K, under the new plan their tax obligation is about $13,500. that's roughly a 30% reduction. now this is simplified and I have left out a lot of the math, but that is the differences between the current taxes and the proposed taxes for the average middle class family. 

this difference is realized within the monetary brackets of the particular tax rates.

if you want I can post the math or you can just do it yourself.