87.18% is the change from 312 to 584
Calculation steps:
[( 584 - 312 ) ÷ 312] x 100 = 87.18%
Formula
Percentage change = [(584 - 312) / 312] x 100
Subtract the new number by the original number
584 - 312 = 272
272 ÷ 312 = 0.8717948717948718
0.8717948717948718 x 100 = 87.18%