100% is the change from 253 to 506
Calculation steps:
[( 506 - 253 ) ÷ 253] x 100 = 100%
Formula
Percentage change = [(506 - 253) / 253] x 100
Subtract the new number by the original number
506 - 253 = 253
253 ÷ 253 = 1
1 x 100 = 100%
Example