-33% is the change from 809 to 542
Calculation steps:
[( 542 - 809 ) ÷ 809] x 100 = -33%
Formula
Percentage change = [(542 - 809) / 809] x 100
Subtract the new number by the original number
542 - 809 = -267
-267 ÷ 809 = -0.3300370828182942
-0.3300370828182942 x 100 = -33%