Simplify the expression: 1-6.2*4-2)+10.8-4.

First, perform multiplication and division from left to right within the parentheses:

$$6 \times 8 = 48$$ $$48 \div 4 = 12$$

Now, perform the subtraction within the parentheses:

$$12 - 2 = 10$$

The expression becomes: $7 \text{ of } 10 + 10 - 8 \div 4$.

"Of" means multiplication.

$$7 \text{ of } 10 = 7 \times 10 = 70$$

The expression becomes: $70 + 10 - 8 \div 4$.

$$8 \div 4 = 2$$

The expression becomes: $70 + 10 - 2$.

$$70 + 10 = 80$$ $$80 - 2 = 78$$

The simplified expression is:

$$78$$