-61.43% is the change from 840 to 324
Calculation steps:
[( 324 - 840 ) ÷ 840] x 100 = -61.43%
Formula
Percentage change = [(324 - 840) / 840] x 100
Subtract the new number by the original number
324 - 840 = -516
-516 ÷ 840 = -0.6142857142857143
-0.6142857142857143 x 100 = -61.43%