283.09% is the change from 136 to 521
Calculation steps:
[( 521 - 136 ) ÷ 136] x 100 = 283.09%
Formula
Percentage change = [(521 - 136) / 136] x 100
Subtract the new number by the original number
521 - 136 = 385
385 ÷ 136 = 2.8308823529411766
2.8308823529411766 x 100 = 283.09%