-70.24% is the change from 830 to 247
Calculation steps:
[( 247 - 830 ) ÷ 830] x 100 = -70.24%
Formula
Percentage change = [(247 - 830) / 830] x 100
Subtract the new number by the original number
247 - 830 = -583
-583 ÷ 830 = -0.7024096385542169
-0.7024096385542169 x 100 = -70.24%