$4.$ ?Eye Travel: Rainbow Camping makes outdoor equipment for camping and backpacking that it sells online. Because Rainbow Camping mails each of its sales from its distribution center direct to the consumer, it spends considerable funds each month on outbound shipping. Rainbow Camping also has costs related to inbound shipping to get its products from the manufacturers to its distribution center. Rainbow Camping would like to examine its outbound and inbound shipping expenses over the last $12$ ?months $($ labeled months $1$ ?through $12).$ ?These shipping costs are shown in the following table.