47% off 30 pounds = 15.90
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30% off of 47 = 70% [100%-30%] left of 47 = 47*70/100 = 32.9
47% of 30= 47% * 30= 0.47 * 30= 14.1
47 pounds sterling x 0.20 = 9.4 pounds sterling
10.6383% increase.
10 ÷ 100 × 4700 = 470 (or £4.70)