851.43% is the change from 70 to 666
Calculation steps:
[( 666 - 70 ) ÷ 70] x 100 = 851.43%
Formula
Percentage change = [(666 - 70) / 70] x 100
Subtract the new number by the original number
666 - 70 = 596
596 ÷ 70 = 8.514285714285714
8.514285714285714 x 100 = 851.43%