To add 9.25 percent to 14.99 just divide the percentage (9.25) by 100, add 1 to this value, then multiply it by the initial value (14.99), so:
Final Value = 14.99 × (1 + 9.25/100)
Final Value = 14.99 × (1 + 0.0925)
Final Value = 14.99 × (1.0925)
Final Value = 16.376575