115% is the change from 100 to 215
Calculation steps:
[( 215 - 100 ) ÷ 100] x 100 = 115%
Formula
Percentage change = [(215 - 100) / 100] x 100
Subtract the new number by the original number
215 - 100 = 115
115 ÷ 100 = 1.15
1.15 x 100 = 115%
Example