1640% is the change from 15 to 261
Calculation steps:
[( 261 - 15 ) ÷ 15] x 100 = 1640%
Formula
Percentage change = [(261 - 15) / 15] x 100
Subtract the new number by the original number
261 - 15 = 246
246 ÷ 15 = 16.4
16.4 x 100 = 1640%
Example