3000% is the change from 7 to 217
Calculation steps:
[( 217 - 7 ) ÷ 7] x 100 = 3000%
Formula
Percentage change = [(217 - 7) / 7] x 100
Subtract the new number by the original number
217 - 7 = 210
210 ÷ 7 = 30
30 x 100 = 3000%
Example