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EmpressFelicity says
My preferred way of doing this is to make the 100 billion and 14 trillion into a fraction, i.e.
100,000,000,000/14,000,000,000,000
Then cancel as many zeros as possible, to give
1/140
To turn this into a percentage you multiply by 100, which gives
100/140
which cancels down to
10/14
This is about 0.7%.

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