-76.8% is the change from 306 to 71
Calculation steps:
[( 71 - 306 ) ÷ 306] x 100 = -76.8%
Formula
Percentage change = [(71 - 306) / 306] x 100
Subtract the new number by the original number
71 - 306 = -235
-235 ÷ 306 = -0.7679738562091504
-0.7679738562091504 x 100 = -76.8%