-82.8% is the change from 407 to 70
Calculation steps:
[( 70 - 407 ) ÷ 407] x 100 = -82.8%
Formula
Percentage change = [(70 - 407) / 407] x 100
Subtract the new number by the original number
70 - 407 = -337
-337 ÷ 407 = -0.828009828009828
-0.828009828009828 x 100 = -82.8%