-35.71% is the change from 70 to 45
Calculation steps:
[( 45 - 70 ) ÷ 70] x 100 = -35.71%
Formula
Percentage change = [(45 - 70) / 70] x 100
Subtract the new number by the original number
45 - 70 = -25
-25 ÷ 70 = -0.35714285714285715
-0.35714285714285715 x 100 = -35.71%