-82.86% is the change from 70 to 12
Calculation steps:
[( 12 - 70 ) ÷ 70] x 100 = -82.86%
Formula
Percentage change = [(12 - 70) / 70] x 100
Subtract the new number by the original number
12 - 70 = -58
-58 ÷ 70 = -0.8285714285714286
-0.8285714285714286 x 100 = -82.86%