1840% is the change from 15 to 291
Calculation steps:
[( 291 - 15 ) ÷ 15] x 100 = 1840%
Formula
Percentage change = [(291 - 15) / 15] x 100
Subtract the new number by the original number
291 - 15 = 276
276 ÷ 15 = 18.4
18.4 x 100 = 1840%
Example