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_28 (_percentage_of_1_rep_max_last_set_ VARCHAR, set_4 VARCHAR)
### Question:
How many % of 1 Rep Max(Last Set) has a Set 4 of 145lb x 5reps?
### Answer:
SELECT _percentage_of_1_rep_max_last_set_ FROM table_name_28 WHERE set_4 = "145lb x 5reps"