267.14% is the change from 70 to 257
Calculation steps:
[( 257 - 70 ) ÷ 70] x 100 = 267.14%
Formula
Percentage change = [(257 - 70) / 70] x 100
Subtract the new number by the original number
257 - 70 = 187
187 ÷ 70 = 2.6714285714285713
2.6714285714285713 x 100 = 267.14%