-69.66% is the change from 847 to 257
Calculation steps:
[( 257 - 847 ) ÷ 847] x 100 = -69.66%
Formula
Percentage change = [(257 - 847) / 847] x 100
Subtract the new number by the original number
257 - 847 = -590
-590 ÷ 847 = -0.6965761511216056
-0.6965761511216056 x 100 = -69.66%