def calculate_total(price_list: List[list]) -> int: """Return the sum of all second elements in the sublists of price_list.

Precondition: price_list is a list of lists of length 2, and the second element of it sublist is an int.

>>> price_list = [["apple", 1], ["sugar", 5], ["mango", 3], ... ["coffee", 9], ["trail mix", 6]] >>> calculate_total(price_list)