-37.8% is the change from 828 to 515
Calculation steps:
[( 515 - 828 ) ÷ 828] x 100 = -37.8%
Formula
Percentage change = [(515 - 828) / 828] x 100
Subtract the new number by the original number
515 - 828 = -313
-313 ÷ 828 = -0.3780193236714976
-0.3780193236714976 x 100 = -37.8%