-26.44% is the change from 87 to 64
Calculation steps:
[( 64 - 87 ) ÷ 87] x 100 = -26.44%
Formula
Percentage change = [(64 - 87) / 87] x 100
Subtract the new number by the original number
64 - 87 = -23
-23 ÷ 87 = -0.26436781609195403
-0.26436781609195403 x 100 = -26.44%