215% is the change from 100 to 315
Calculation steps:
[( 315 - 100 ) ÷ 100] x 100 = 215%
Formula
Percentage change = [(315 - 100) / 100] x 100
Subtract the new number by the original number
315 - 100 = 215
215 ÷ 100 = 2.15
2.15 x 100 = 215%
Example