331.11% is the change from 90 to 388
Calculation steps:
[( 388 - 90 ) ÷ 90] x 100 = 331.11%
Formula
Percentage change = [(388 - 90) / 90] x 100
Subtract the new number by the original number
388 - 90 = 298
298 ÷ 90 = 3.311111111111111
3.311111111111111 x 100 = 331.11%