-29.33% is the change from 900 to 636
Calculation steps:
[( 636 - 900 ) ÷ 900] x 100 = -29.33%
Formula
Percentage change = [(636 - 900) / 900] x 100
Subtract the new number by the original number
636 - 900 = -264
-264 ÷ 900 = -0.29333333333333333
-0.29333333333333333 x 100 = -29.33%