31.48% is the change from 216 to 284
Calculation steps:
[( 284 - 216 ) ÷ 216] x 100 = 31.48%
Formula
Percentage change = [(284 - 216) / 216] x 100
Subtract the new number by the original number
284 - 216 = 68
68 ÷ 216 = 0.3148148148148148
0.3148148148148148 x 100 = 31.48%