Yes Trump has a history of announcing shocks and then quietly back-peddling etc.
But the numbers come from the big placard he holds up. There are pics of his announcement holding his rate card in article if you scroll down.
We run a very small business (luckily just for side income). One of our suppliers expects prices to go up 45-55% by the time this is done. It sucks out loud because there are literally no suppliers from the US for the parts we need.