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Verified Answer :

£2.700 - £1890 = £810

£ (money) -------------- percentage (%)
2.700 -------------------- 100
810 ----------------------- x

2700x = 810100
2700x = 81000
\(x = \frac{81000}{2700}\)
\(\boxed{x = 30}\)

Answer: 
Percentage loss = 30%