1953.33% is the change from 15 to 308
Calculation steps:
[( 308 - 15 ) ÷ 15] x 100 = 1953.33%
Formula
Percentage change = [(308 - 15) / 15] x 100
Subtract the new number by the original number
308 - 15 = 293
293 ÷ 15 = 19.533333333333335
19.533333333333335 x 100 = 1953.33%