GCSE Maths Percentages
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How to find out percentage increase: Increase £80 by 6%
100 + 6 = 106, 106 / 100 = 1.06, 1.06 x 80 = £84.80
Original price: Find the original price of a dress reduced by 15% to £32.30
100 - 15 = 85%, 85/100 = 0.85, 32.20 / 0.85 = £38
How to find out percentage decrease: Decrease £80 by 6%
100 - 6 = 94, 94 / 100 = 0.94, 0.94 x 80 = £75.20
Compound interest: Invest £300 against 3% interest for four years
300 (1+3/100)4 = 300 x 16034
Profit percentage: Bought dress for £35 and sold for £55, what is percentage profit?
55 - 35 = £20, 20/35 = 20/35 x 100 = 57%