How were Trump’s tariffs calculated?

US President Donald Trump has imposed a 10% tariff on goods from most countries being imported into the US, with even higher rates for what he calls the “worst offenders”.
But how exactly were these tariffs – essentially taxes on imports – worked out? BBC Verify has been looking at the calculations behind the numbers.
When Trump presented a giant cardboard chart detailing the tariffs in the White House Rose Garden it was initially assumed that the charges were based on a combination of existing tariffs and other trade barriers (like regulations).
But later, the White House published what might look like a complicated mathematical formula.
But the actual exercise boiled down to simple maths: take the trade deficit for the US in goods with a particular country, divide that by the total goods imports from that country and then divide that number by two.

Source: BBC