840% is the change from 15 to 141
Calculation steps:
[( 141 - 15 ) ÷ 15] x 100 = 840%
Formula
Percentage change = [(141 - 15) / 15] x 100
Subtract the new number by the original number
141 - 15 = 126
126 ÷ 15 = 8.4
8.4 x 100 = 840%
Example