The answer depends on the units used for 0.0000003 as well as what the 1 pound measures. It should be blindingly obvious to anybody that the answers for 0.0000003 tons or GBP0.0000003 billion will be very different.
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It is 3/20.
It is 5/100.
one eighth £1 / £8 = 1 / 8
twenty£1.00 / £0.05 = 20
It depends on what the fraction is.