90.57% is the change from 509 to 970
Calculation steps:
[( 970 - 509 ) ÷ 509] x 100 = 90.57%
Formula
Percentage change = [(970 - 509) / 509] x 100
Subtract the new number by the original number
970 - 509 = 461
461 ÷ 509 = 0.9056974459724951
0.9056974459724951 x 100 = 90.57%