-74.29% is the change from 70 to 18
Calculation steps:
[( 18 - 70 ) ÷ 70] x 100 = -74.29%
Formula
Percentage change = [(18 - 70) / 70] x 100
Subtract the new number by the original number
18 - 70 = -52
-52 ÷ 70 = -0.7428571428571429
-0.7428571428571429 x 100 = -74.29%