-49.4% is the change from 415 to 210
Calculation steps:
[( 210 - 415 ) ÷ 415] x 100 = -49.4%
Formula
Percentage change = [(210 - 415) / 415] x 100
Subtract the new number by the original number
210 - 415 = -205
-205 ÷ 415 = -0.4939759036144578
-0.4939759036144578 x 100 = -49.4%