840% is the change from 70 to 658
Calculation steps:
[( 658 - 70 ) ÷ 70] x 100 = 840%
Formula
Percentage change = [(658 - 70) / 70] x 100
Subtract the new number by the original number
658 - 70 = 588
588 ÷ 70 = 8.4
8.4 x 100 = 840%
Example