1613.33% is the change from 15 to 257
Calculation steps:
[( 257 - 15 ) ÷ 15] x 100 = 1613.33%
Formula
Percentage change = [(257 - 15) / 15] x 100
Subtract the new number by the original number
257 - 15 = 242
242 ÷ 15 = 16.133333333333333
16.133333333333333 x 100 = 1613.33%