38.49% is the change from 304 to 421
Calculation steps:
[( 421 - 304 ) ÷ 304] x 100 = 38.49%
Formula
Percentage change = [(421 - 304) / 304] x 100
Subtract the new number by the original number
421 - 304 = 117
117 ÷ 304 = 0.3848684210526316
0.3848684210526316 x 100 = 38.49%