20.35% is the change from 511 to 615
Calculation steps:
[( 615 - 511 ) ÷ 511] x 100 = 20.35%
Formula
Percentage change = [(615 - 511) / 511] x 100
Subtract the new number by the original number
615 - 511 = 104
104 ÷ 511 = 0.2035225048923679
0.2035225048923679 x 100 = 20.35%