834.78% is the change from 69 to 645
Calculation steps:
[( 645 - 69 ) ÷ 69] x 100 = 834.78%
Formula
Percentage change = [(645 - 69) / 69] x 100
Subtract the new number by the original number
645 - 69 = 576
576 ÷ 69 = 8.347826086956522
8.347826086956522 x 100 = 834.78%