51.99% is the change from 277 to 421
Calculation steps:
[( 421 - 277 ) ÷ 277] x 100 = 51.99%
Formula
Percentage change = [(421 - 277) / 277] x 100
Subtract the new number by the original number
421 - 277 = 144
144 ÷ 277 = 0.51985559566787
0.51985559566787 x 100 = 51.99%