11 , 13 + 3000 ⋅ ( 0 , 803 − 0 , 8 ) + ( 561 , 9 − 67 , 9 ) ÷ 100 =

To compute the given expression step by step:

1. Calculate the subtraction inside the parentheses:
   561.9 - 67.9 = 494

2. Calculate the subtraction in the outer parentheses and the multiplication:
   0.803 - 0.8 = 0.003
   3000 * 0.003 = 9

3. Calculate the addition and division:
   494 + 9 = 503
   503 / 100 = 5.03

4. Now, add 13 to the result:
   5.03 + 13 = 18.03

Therefore, the final result of the expression is 18.03.