-78.19% is the change from 321 to 70
Calculation steps:
[( 70 - 321 ) ÷ 321] x 100 = -78.19%
Formula
Percentage change = [(70 - 321) / 321] x 100
Subtract the new number by the original number
70 - 321 = -251
-251 ÷ 321 = -0.7819314641744548
-0.7819314641744548 x 100 = -78.19%