8.84% is the change from 215 to 234
Calculation steps:
[( 234 - 215 ) ÷ 215] x 100 = 8.84%
Formula
Percentage change = [(234 - 215) / 215] x 100
Subtract the new number by the original number
234 - 215 = 19
19 ÷ 215 = 0.08837209302325581
0.08837209302325581 x 100 = 8.84%