​Calculate: 5.5 × 3.2 + 2.1 - 1.2 ÷ 6 of 1 - 1 ÷ 30​

Correct option is C

Given:

Evaluate the expression:
​$$5.5 \times 3.2 + 2.1 - 1.2 \div 6 \text{ of } 1 - 1 \div 30$$​

Steps:

1. Follow the BODMAS rule (Brackets, Orders, Division and Multiplication, Addition and Subtraction).

The given expression is:
​$$5.5 \times 3.2 + 2.1 - \frac{1.2}{6} \text{ of } 1 - \frac{1}{30}$$​

2. Evaluate 'of' and division first:
1.2 $$\div$$​ 6 = 0.2
​$$0.2 \text{ of } 1 = 0.2$$​
​$$1 \div 30$$​ = 0.0333 (approx. to 4 decimal places).
Substituting these, we get:
​$$5.5 \times 3.2 + 2.1 - 0.2 - 0.0333$$​

3. Perform multiplication:
​$$5.5 \times 3.2 = 17.6$$​
Substituting this, the expression becomes:
17.6 + 2.1 - 0.2 - 0.0333

4. Perform addition and subtraction in sequence:
17.6 + 2.1 = 19.7
19.7 - 0.2 = 19.5
19.5 - 0.0333 = 19.4667

Final Answer:

The final value of the expression is:

​$$\boxed{19.467}$$​.