106.75% is the change from 252 to 521
Calculation steps:
[( 521 - 252 ) ÷ 252] x 100 = 106.75%
Formula
Percentage change = [(521 - 252) / 252] x 100
Subtract the new number by the original number
521 - 252 = 269
269 ÷ 252 = 1.0674603174603174
1.0674603174603174 x 100 = 106.75%