Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_99 (frequency_mhz INTEGER, class VARCHAR)
### Question:
What is the total of Frequency MHz with a Class of b1?
### Answer:
SELECT SUM(frequency_mhz) FROM table_name_99 WHERE class = "b1"