628.57% is the change from 70 to 510
Calculation steps:
[( 510 - 70 ) ÷ 70] x 100 = 628.57%
Formula
Percentage change = [(510 - 70) / 70] x 100
Subtract the new number by the original number
510 - 70 = 440
440 ÷ 70 = 6.285714285714286
6.285714285714286 x 100 = 628.57%