-77.7% is the change from 287 to 64
Calculation steps:
[( 64 - 287 ) ÷ 287] x 100 = -77.7%
Formula
Percentage change = [(64 - 287) / 287] x 100
Subtract the new number by the original number
64 - 287 = -223
-223 ÷ 287 = -0.7770034843205574
-0.7770034843205574 x 100 = -77.7%