plz solve it now Q$4$: $(30$ points$)$ a$.$ The Thor International Company operates four factories that ship products $($in pallets$)$ to four warehouses. The shipping costs, requirements, and capacities are shown in the figure. Use the Least Cost Method to find the shipping schedule that minimizes shipping cost.

$\backslash$table$[[$Warehouse$/$Store$,$$$1,$$$2,53,$$$4,$Supply$],[$A$,,15\mathrm{.}3,,11\mathrm{.}4,,5\mathrm{.}1,,15\mathrm{.}0,50],[$B$,,16\mathrm{.}2,,2\mathrm{.}9,,6\mathrm{.}6,,27\mathrm{.}3,50],[$c$,,5\mathrm{.}6,,19\mathrm{.}1,,8\mathrm{.}8,,30\mathrm{.}5,150],[$D$,,4\mathrm{.}3,,7\mathrm{.}3,,6\mathrm{.}1,,8\mathrm{.}2,50],[$Demand$,75,,75,,85,,65,,]]$

Total Cost $=$

Q$4$:b$.$ The city of Smalltown consists of five subdivisions. Mayor John Lion wants to build telephone lines to ensure that all the subdivisions can communicate with each other. The distances between the subdivisions are given in Figure below. What is the minimum length of telephone line required? Draw the minimum spanning tree.