-13.47% is the change from 297 to 257
Calculation steps:
[( 257 - 297 ) ÷ 297] x 100 = -13.47%
Formula
Percentage change = [(257 - 297) / 297] x 100
Subtract the new number by the original number
257 - 297 = -40
-40 ÷ 297 = -0.13468013468013468
-0.13468013468013468 x 100 = -13.47%