210% is the change from 70 to 217
Calculation steps:
[( 217 - 70 ) ÷ 70] x 100 = 210%
Formula
Percentage change = [(217 - 70) / 70] x 100
Subtract the new number by the original number
217 - 70 = 147
147 ÷ 70 = 2.1
2.1 x 100 = 210%
Example