That just depends on how the teacher or whoever you are doing it for, wants it written.
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30 = thirty.
It is: thirty = 30
30% of 100 = 100*30/100 = 30
thirty percent of twenty five thousand pounds = £7500 30% of £25000 = 30% * £25000 = 30%/100% * £25000 = £7500
30