838.57% is the change from 70 to 657
Calculation steps:
[( 657 - 70 ) ÷ 70] x 100 = 838.57%
Formula
Percentage change = [(657 - 70) / 70] x 100
Subtract the new number by the original number
657 - 70 = 587
587 ÷ 70 = 8.385714285714286
8.385714285714286 x 100 = 838.57%