219.68% is the change from 310 to 991
Calculation steps:
[( 991 - 310 ) ÷ 310] x 100 = 219.68%
Formula
Percentage change = [(991 - 310) / 310] x 100
Subtract the new number by the original number
991 - 310 = 681
681 ÷ 310 = 2.196774193548387
2.196774193548387 x 100 = 219.68%