21.43% is the change from 252 to 306
Calculation steps:
[( 306 - 252 ) ÷ 252] x 100 = 21.43%
Formula
Percentage change = [(306 - 252) / 252] x 100
Subtract the new number by the original number
306 - 252 = 54
54 ÷ 252 = 0.21428571428571427
0.21428571428571427 x 100 = 21.43%