-61.01% is the change from 831 to 324
Calculation steps:
[( 324 - 831 ) ÷ 831] x 100 = -61.01%
Formula
Percentage change = [(324 - 831) / 831] x 100
Subtract the new number by the original number
324 - 831 = -507
-507 ÷ 831 = -0.6101083032490975
-0.6101083032490975 x 100 = -61.01%