-42.75% is the change from 138 to 79
Calculation steps:
[( 79 - 138 ) ÷ 138] x 100 = -42.75%
Formula
Percentage change = [(79 - 138) / 138] x 100
Subtract the new number by the original number
79 - 138 = -59
-59 ÷ 138 = -0.427536231884058
-0.427536231884058 x 100 = -42.75%