pls be extremely careful and answer everything from A thru G pls and double check pls. this is supply chain management class question.

Suppose you are a manager working at the Home Depot cross-dock outside of Los Angeles. A cross-dock is a type of transportation terminal, where shipments in inbound containers are unloaded, sorted, and re-packed into outbound truck trailers. Suppose on a given day, you have unloaded 12 customer shipments that are destined for the distribution center in Albany, New York. You now wish to pack the fewest number of outbound trailers necessary. Suppose each long-haul truck has the capacity to carry 20 tons of freight, and the customer loads are given in the following table: a) Assign customer freight demands to trailer using the Next-Fit heuristic on the unsorted list of customers. How many trucks were required? b) How many customers will be served by your third trailer using the Next-Fit heuristic? c) Assign customer freight demands to trailer using the First-Fit heuristic on the unsorted list of customers. How many trucks were required? d) What is total weight in you second trailer in tons using the the First-Fit heuristic? e) Assign customer freight demands to trailer using the Best-Fit heuristic on the unsorted list of customers. How many trucks were required? f) What is total weight in you third trailer in tons using the Best-Fit heuristic? 9) What is a lower bound for the number of trailers you need