51.62% is the change from 277 to 420
Calculation steps:
[( 420 - 277 ) ÷ 277] x 100 = 51.62%
Formula
Percentage change = [(420 - 277) / 277] x 100
Subtract the new number by the original number
420 - 277 = 143
143 ÷ 277 = 0.516245487364621
0.516245487364621 x 100 = 51.62%