-78.57% is the change from 210 to 45
Calculation steps:
[( 45 - 210 ) ÷ 210] x 100 = -78.57%
Formula
Percentage change = [(45 - 210) / 210] x 100
Subtract the new number by the original number
45 - 210 = -165
-165 ÷ 210 = -0.7857142857142857
-0.7857142857142857 x 100 = -78.57%