-32% is the change from 900 to 612
Calculation steps:
[( 612 - 900 ) ÷ 900] x 100 = -32%
Formula
Percentage change = [(612 - 900) / 900] x 100
Subtract the new number by the original number
612 - 900 = -288
-288 ÷ 900 = -0.32
-0.32 x 100 = -32%
Example