237.5% is the change from 280 to 945
Calculation steps:
[( 945 - 280 ) ÷ 280] x 100 = 237.5%
Formula
Percentage change = [(945 - 280) / 280] x 100
Subtract the new number by the original number
945 - 280 = 665
665 ÷ 280 = 2.375
2.375 x 100 = 237.5%
Example