-57.5% is the change from 240 to 102
Calculation steps:
[( 102 - 240 ) ÷ 240] x 100 = -57.5%
Formula
Percentage change = [(102 - 240) / 240] x 100
Subtract the new number by the original number
102 - 240 = -138
-138 ÷ 240 = -0.575
-0.575 x 100 = -57.5%