1510.53% is the change from 19 to 306
Calculation steps:
[( 306 - 19 ) ÷ 19] x 100 = 1510.53%
Formula
Percentage change = [(306 - 19) / 19] x 100
Subtract the new number by the original number
306 - 19 = 287
287 ÷ 19 = 15.105263157894736
15.105263157894736 x 100 = 1510.53%