90.23% is the change from 266 to 506
Calculation steps:
[( 506 - 266 ) ÷ 266] x 100 = 90.23%
Formula
Percentage change = [(506 - 266) / 266] x 100
Subtract the new number by the original number
506 - 266 = 240
240 ÷ 266 = 0.9022556390977443
0.9022556390977443 x 100 = 90.23%