6.98% is the change from 215 to 230
Calculation steps:
[( 230 - 215 ) ÷ 215] x 100 = 6.98%
Formula
Percentage change = [(230 - 215) / 215] x 100
Subtract the new number by the original number
230 - 215 = 15
15 ÷ 215 = 0.06976744186046512
0.06976744186046512 x 100 = 6.98%