200% is the change from 215 to 645
Calculation steps:
[( 645 - 215 ) ÷ 215] x 100 = 200%
Formula
Percentage change = [(645 - 215) / 215] x 100
Subtract the new number by the original number
645 - 215 = 430
430 ÷ 215 = 2
2 x 100 = 200%
Example