-9.62% is the change from 821 to 742
Calculation steps:
[( 742 - 821 ) ÷ 821] x 100 = -9.62%
Formula
Percentage change = [(742 - 821) / 821] x 100
Subtract the new number by the original number
742 - 821 = -79
-79 ÷ 821 = -0.09622411693057248
-0.09622411693057248 x 100 = -9.62%