what should come in place of question mark (?) in the following questions?
`12%` of `555 + 15%` of 666 = ?

Options

A. 166.5
B. 167.5
C. 168.5
D. 169.5

Answer

To solve the problem, we need to calculate \(12\%\) of \(555\) and \(15\%\) of \(666\), and then add the two results together.

### Step-by-Step Solution:

1. **Calculate \(12\%\) of \(555\)**:
- Convert the percentage to a decimal:
\[ 12\% = \frac{12}{100} = 0.12 \]
- Multiply by \(555\):
\[ 12\% \text{ of } 555 = 0.12 \times 555 \]
- Performing the multiplication:
\[ 0.12 \times 555 = 66.6 \]

2. **Calculate \(15\%\) of \(666\)**:
- Convert the percentage to a decimal:
\[ 15\% = \frac{15}{100} = 0.15 \]
- Multiply by \(666\):
\[ 15\% \text{ of } 666 = 0.15 \times 666 \]
- Performing the multiplication:
\[ 0.15 \times 666 = 99.9 \]

3. **Add the two results together**:
- Now, add \(66.6\) and \(99.9\):
\[ 66.6 + 99.9 = 166.5 \]

4. **Final Result**:
- Therefore, the value that should come in place of the question mark (?) is:
\[ \text{?} = 166.5 \]

### Conclusion:
The answer is \(166.5\).