100*(80 - 50)/50 = 100*30/50 = 60%
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50% of 80= 50% * 80= 0.5 * 80= 4050percent of 80 is equal to 40
62.5 percent of 80 is 50.
50% of £80 = £40 = 50% * £80 = 50%/100% * £80 = £40
Multiply 80 by 1.05 to increase by 5%.
15% of 80 = 80*15/100 = 12 So, an increase of 15% is 80+12 = 92