-77.2% is the change from 307 to 70
Calculation steps:
[( 70 - 307 ) ÷ 307] x 100 = -77.2%
Formula
Percentage change = [(70 - 307) / 307] x 100
Subtract the new number by the original number
70 - 307 = -237
-237 ÷ 307 = -0.7719869706840391
-0.7719869706840391 x 100 = -77.2%