-85.44% is the change from 309 to 45
Calculation steps:
[( 45 - 309 ) ÷ 309] x 100 = -85.44%
Formula
Percentage change = [(45 - 309) / 309] x 100
Subtract the new number by the original number
45 - 309 = -264
-264 ÷ 309 = -0.8543689320388349
-0.8543689320388349 x 100 = -85.44%