142.33% is the change from 215 to 521
Calculation steps:
[( 521 - 215 ) ÷ 215] x 100 = 142.33%
Formula
Percentage change = [(521 - 215) / 215] x 100
Subtract the new number by the original number
521 - 215 = 306
306 ÷ 215 = 1.4232558139534883
1.4232558139534883 x 100 = 142.33%