86.18% is the change from 521 to 970
Calculation steps:
[( 970 - 521 ) ÷ 521] x 100 = 86.18%
Formula
Percentage change = [(970 - 521) / 521] x 100
Subtract the new number by the original number
970 - 521 = 449
449 ÷ 521 = 0.8618042226487524
0.8618042226487524 x 100 = 86.18%