Here's the official source for the calculation: [0].

Also, there are some hints this might be from a LLM [1].

And an official statement that it's about trade imbalances and not reciproc tarrifs [2].

And they ask the affected country to "not retaliate" [3].

IMHO Trump tries to lead the US like he managed his businesses. And here I'd like to refer to the three casinos he owned that are now insolvent [4].

[0] https://universeodon.com/@cryptadamist/114272481124239587

[1] https://universeodon.com/@henryk@chaos.social/11427313249281...

[2] https://ustr.gov/issue-areas/reciprocal-tariff-calculations

[3] https://edition.cnn.com/2025/04/02/business/liberation-day-t...

[4] https://www.nytimes.com/2016/06/12/nyregion/donald-trump-atl...