6.05% is the change from 215 to 228
Calculation steps:
[( 228 - 215 ) ÷ 215] x 100 = 6.05%
Formula
Percentage change = [(228 - 215) / 215] x 100
Subtract the new number by the original number
228 - 215 = 13
13 ÷ 215 = 0.06046511627906977
0.06046511627906977 x 100 = 6.05%