-90.57% is the change from 541 to 51
Calculation steps:
[( 51 - 541 ) ÷ 541] x 100 = -90.57%
Formula
Percentage change = [(51 - 541) / 541] x 100
Subtract the new number by the original number
51 - 541 = -490
-490 ÷ 541 = -0.9057301293900185
-0.9057301293900185 x 100 = -90.57%