135.75% is the change from 221 to 521
Calculation steps:
[( 521 - 221 ) ÷ 221] x 100 = 135.75%
Formula
Percentage change = [(521 - 221) / 221] x 100
Subtract the new number by the original number
521 - 221 = 300
300 ÷ 221 = 1.3574660633484164
1.3574660633484164 x 100 = 135.75%