------
## 最终结论
```python
def round_and_sum(numbers):
    rounded_numbers = [round(num) for num in numbers]
    total_sum = sum(rounded_numbers)
    return total_sum * len(numbers)

# Test cases
assert round_and_sum([22.4, 4.0, -16.22, -9.10, 11.00, -12.22, 14.20, -5.20, 17.50]) == 243
assert round_and_sum([5,2,9,24.3,29]) == 345
assert round_and_sum([25.0,56.7,89.2]) == 513
```