102.5% is the change from 240 to 486
Calculation steps:
[( 486 - 240 ) ÷ 240] x 100 = 102.5%
Formula
Percentage change = [(486 - 240) / 240] x 100
Subtract the new number by the original number
486 - 240 = 246
246 ÷ 240 = 1.025
1.025 x 100 = 102.5%
Example