-20% is the change from 545 to 436
Calculation steps:
[( 436 - 545 ) ÷ 545] x 100 = -20%
Formula
Percentage change = [(436 - 545) / 545] x 100
Subtract the new number by the original number
436 - 545 = -109
-109 ÷ 545 = -0.2
-0.2 x 100 = -20%
Example