Just read that this morning. Although Trump claimed that the new tariff rates were set at 50% of the tariffs charged by other countries on US goods, that turns out, inevitably, to be a flat-out lie. Instead they've calculated the percentage trade imbalance and halved that. So if a county sells $2bn of goods to the US and only buys $1bn, ie 50%, they've been slapped with a 25% tariff.
Personally I think that if Trump is serious about this and persists with it, it's the beginning of the end for him. The effect on the US economy and inflation rates will be massive and extremely damaging, and in the short term at least it will delivery precisely the opposite effect to what he's promised. I suspect that although US citizens will apparently put up with a great deal by way of lies, racism and damage to democracy, they won't like inflation, stock market crashes and loss of jobs one bit.