-14.29% is the change from 70 to 60
Calculation steps:
[( 60 - 70 ) ÷ 70] x 100 = -14.29%
Formula
Percentage change = [(60 - 70) / 70] x 100
Subtract the new number by the original number
60 - 70 = -10
-10 ÷ 70 = -0.14285714285714285
-0.14285714285714285 x 100 = -14.29%