-83.37% is the change from 421 to 70
Calculation steps:
[( 70 - 421 ) ÷ 421] x 100 = -83.37%
Formula
Percentage change = [(70 - 421) / 421] x 100
Subtract the new number by the original number
70 - 421 = -351
-351 ÷ 421 = -0.833729216152019
-0.833729216152019 x 100 = -83.37%