250% is the change from 70 to 245
Calculation steps:
[( 245 - 70 ) ÷ 70] x 100 = 250%
Formula
Percentage change = [(245 - 70) / 70] x 100
Subtract the new number by the original number
245 - 70 = 175
175 ÷ 70 = 2.5
2.5 x 100 = 250%
Example