-62.96% is the change from 810 to 300
Calculation steps:
[( 300 - 810 ) ÷ 810] x 100 = -62.96%
Formula
Percentage change = [(300 - 810) / 810] x 100
Subtract the new number by the original number
300 - 810 = -510
-510 ÷ 810 = -0.6296296296296297
-0.6296296296296297 x 100 = -62.96%