Despite a White House spokesman claiming otherwise, the published formula matched what social media users calculated.

Donald Trump and his team had said that a wide array of practices would go into their calculations of 'reciprocal' tariffs.

Speaker 1: Hiya, can I help you? Speaker 2: Oh yes please I've got this £20.00 off voucher, I'd quite like these 4 canvases and I know you've got the 20% discount and I wondered if I could afford it?