-96.11% is the change from 257 to 10
Calculation steps:
[( 10 - 257 ) ÷ 257] x 100 = -96.11%
Formula
Percentage change = [(10 - 257) / 257] x 100
Subtract the new number by the original number
10 - 257 = -247
-247 ÷ 257 = -0.9610894941634242
-0.9610894941634242 x 100 = -96.11%