89.97% is the change from 309 to 587
Calculation steps:
[( 587 - 309 ) ÷ 309] x 100 = 89.97%
Formula
Percentage change = [(587 - 309) / 309] x 100
Subtract the new number by the original number
587 - 309 = 278
278 ÷ 309 = 0.8996763754045307
0.8996763754045307 x 100 = 89.97%