358.57% is the change from 70 to 321
Calculation steps:
[( 321 - 70 ) ÷ 70] x 100 = 358.57%
Formula
Percentage change = [(321 - 70) / 70] x 100
Subtract the new number by the original number
321 - 70 = 251
251 ÷ 70 = 3.585714285714286
3.585714285714286 x 100 = 358.57%