-66.53% is the change from 242 to 81
Calculation steps:
[( 81 - 242 ) ÷ 242] x 100 = -66.53%
Formula
Percentage change = [(81 - 242) / 242] x 100
Subtract the new number by the original number
81 - 242 = -161
-161 ÷ 242 = -0.6652892561983471
-0.6652892561983471 x 100 = -66.53%