34.33% is the change from 670 to 900
Calculation steps:
[( 900 - 670 ) ÷ 670] x 100 = 34.33%
Formula
Percentage change = [(900 - 670) / 670] x 100
Subtract the new number by the original number
900 - 670 = 230
230 ÷ 670 = 0.34328358208955223
0.34328358208955223 x 100 = 34.33%