-11.3% is the change from 115 to 102
Calculation steps:
[( 102 - 115 ) ÷ 115] x 100 = -11.3%
Formula
Percentage change = [(102 - 115) / 115] x 100
Subtract the new number by the original number
102 - 115 = -13
-13 ÷ 115 = -0.11304347826086956
-0.11304347826086956 x 100 = -11.3%