-77.36% is the change from 402 to 91
Calculation steps:
[( 91 - 402 ) ÷ 402] x 100 = -77.36%
Formula
Percentage change = [(91 - 402) / 402] x 100
Subtract the new number by the original number
91 - 402 = -311
-311 ÷ 402 = -0.7736318407960199
-0.7736318407960199 x 100 = -77.36%