61.54% is the change from 312 to 504
Calculation steps:
[( 504 - 312 ) ÷ 312] x 100 = 61.54%
Formula
Percentage change = [(504 - 312) / 312] x 100
Subtract the new number by the original number
504 - 312 = 192
192 ÷ 312 = 0.6153846153846154
0.6153846153846154 x 100 = 61.54%