66.16% is the change from 331 to 550
Calculation steps:
[( 550 - 331 ) ÷ 331] x 100 = 66.16%
Formula
Percentage change = [(550 - 331) / 331] x 100
Subtract the new number by the original number
550 - 331 = 219
219 ÷ 331 = 0.6616314199395771
0.6616314199395771 x 100 = 66.16%