In this case, we'll have to carry out several steps to find the solution. 
Step 01:
Data
initial salary = $30,310/year 
salary increase percentage = 26% 
final salary = ? 
Step 02:
final salary = initial salary + initial salary * salary increase percentage
final salary = $30310 + $30310 * 0.26 
final salary = $38190.6 
Formula: 
new amount = base amount + base amount * percent of change 
 = 30310 + 30310 * 0.26 
 = 30310 + 7880.6 
 = 38190.6 
The answer is:
final salary = $38190.6 = 38