-80.6% is the change from 402 to 78
Calculation steps:
[( 78 - 402 ) ÷ 402] x 100 = -80.6%
Formula
Percentage change = [(78 - 402) / 402] x 100
Subtract the new number by the original number
78 - 402 = -324
-324 ÷ 402 = -0.8059701492537313
-0.8059701492537313 x 100 = -80.6%