55% is the change from 200 to 310
Calculation steps:
[( 310 - 200 ) ÷ 200] x 100 = 55%
Formula
Percentage change = [(310 - 200) / 200] x 100
Subtract the new number by the original number
310 - 200 = 110
110 ÷ 200 = 0.55
0.55 x 100 = 55%
Example