-69.77% is the change from 817 to 247
Calculation steps:
[( 247 - 817 ) ÷ 817] x 100 = -69.77%
Formula
Percentage change = [(247 - 817) / 817] x 100
Subtract the new number by the original number
247 - 817 = -570
-570 ÷ 817 = -0.6976744186046512
-0.6976744186046512 x 100 = -69.77%