6.97% is the change from 287 to 307
Calculation steps:
[( 307 - 287 ) ÷ 287] x 100 = 6.97%
Formula
Percentage change = [(307 - 287) / 287] x 100
Subtract the new number by the original number
307 - 287 = 20
20 ÷ 287 = 0.06968641114982578
0.06968641114982578 x 100 = 6.97%