75% is the change from 180 to 315
Calculation steps:
[( 315 - 180 ) ÷ 180] x 100 = 75%
Formula
Percentage change = [(315 - 180) / 180] x 100
Subtract the new number by the original number
315 - 180 = 135
135 ÷ 180 = 0.75
0.75 x 100 = 75%
Example