20.05% is the change from 434 to 521
Calculation steps:
[( 521 - 434 ) ÷ 434] x 100 = 20.05%
Formula
Percentage change = [(521 - 434) / 434] x 100
Subtract the new number by the original number
521 - 434 = 87
87 ÷ 434 = 0.20046082949308755
0.20046082949308755 x 100 = 20.05%