7.57% is the change from 251 to 270
Calculation steps:
[( 270 - 251 ) ÷ 251] x 100 = 7.57%
Formula
Percentage change = [(270 - 251) / 251] x 100
Subtract the new number by the original number
270 - 251 = 19
19 ÷ 251 = 0.07569721115537849
0.07569721115537849 x 100 = 7.57%