-18.25% is the change from 515 to 421
Calculation steps:
[( 421 - 515 ) ÷ 515] x 100 = -18.25%
Formula
Percentage change = [(421 - 515) / 515] x 100
Subtract the new number by the original number
421 - 515 = -94
-94 ÷ 515 = -0.1825242718446602
-0.1825242718446602 x 100 = -18.25%