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Answer: 3,000,000%


£15,000 $-$ 50p = £14,999.50 as a % of 50p
£14,999.50 $\approx$ £15,000
     50p   =   100%
      £1    =   200%
  £1000  = 200,000%
£15,000 = 3,000,000%
 
 

This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.