69.26% is the change from 257 to 435
Calculation steps:
[( 435 - 257 ) ÷ 257] x 100 = 69.26%
Formula
Percentage change = [(435 - 257) / 257] x 100
Subtract the new number by the original number
435 - 257 = 178
178 ÷ 257 = 0.6926070038910506
0.6926070038910506 x 100 = 69.26%