-71.43% is the change from 7 to 2
Calculation steps:
[( 2 - 7 ) ÷ 7] x 100 = -71.43%
Formula
Percentage change = [(2 - 7) / 7] x 100
Subtract the new number by the original number
2 - 7 = -5
-5 ÷ 7 = -0.7142857142857143
-0.7142857142857143 x 100 = -71.43%