-23.44% is the change from 320 to 245
Calculation steps:
[( 245 - 320 ) ÷ 320] x 100 = -23.44%
Formula
Percentage change = [(245 - 320) / 320] x 100
Subtract the new number by the original number
245 - 320 = -75
-75 ÷ 320 = -0.234375
-0.234375 x 100 = -23.44%