400% increase.
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20 percent increase on 500 = 60020% increased on 500=500 + (20% * 500)=500 + (0.20 * 500)=500 + 100= 600=25.38 + (1.5% * 25.38)=25.38 + (0.15 * 25.38)=25.38 + 3.81= 29.19
100 percent of 500 = 500
100/(500/100) = 20%
percentage_increase = (new - old)/old x 100 % = (72 - 12)/12 x 100 % = 500 %
500% increase.