Nope, you've got it wrong, pittipat. I'd love to see those lower tax rates and I think we probably will either with the passage of the bill or very shortly thereafter.
I believe the economic expansion alone will cause the rates to drop. No matter what the rate, though, I still expect to see it calculated correctly from whatever rate is in the final bill. It that is 23% t-i, then the correct t-e rate would be 29.87% since it would be derived from the bill's figure. Sales tax rates are frequently carried to two decimal places but I have never seen them calculated beyond that.
For discussion purposes, the rate is 30%. Get over it. If you wish to use the 29.87% number, knock yourself out. I am getting a kick over how annal you are being about this.