70.97% is the change from 310 to 530
Calculation steps:
[( 530 - 310 ) ÷ 310] x 100 = 70.97%
Formula
Percentage change = [(530 - 310) / 310] x 100
Subtract the new number by the original number
530 - 310 = 220
220 ÷ 310 = 0.7096774193548387
0.7096774193548387 x 100 = 70.97%