311.38% is the change from 123 to 506
Calculation steps:
[( 506 - 123 ) ÷ 123] x 100 = 311.38%
Formula
Percentage change = [(506 - 123) / 123] x 100
Subtract the new number by the original number
506 - 123 = 383
383 ÷ 123 = 3.113821138211382
3.113821138211382 x 100 = 311.38%