-41.1% is the change from 545 to 321
Calculation steps:
[( 321 - 545 ) ÷ 545] x 100 = -41.1%
Formula
Percentage change = [(321 - 545) / 545] x 100
Subtract the new number by the original number
321 - 545 = -224
-224 ÷ 545 = -0.41100917431192663
-0.41100917431192663 x 100 = -41.1%